diff --git a/src/mightypork/gamecore/gui/components/LayoutComponent.java b/src/mightypork/gamecore/gui/components/LayoutComponent.java
index 3c18664..2254b38 100644
--- a/src/mightypork/gamecore/gui/components/LayoutComponent.java
+++ b/src/mightypork/gamecore/gui/components/LayoutComponent.java
@@ -13,7 +13,6 @@ import mightypork.util.constraints.rect.proxy.RectBound;
 import mightypork.util.control.Enableable;
 import mightypork.util.control.eventbus.EventBus;
 import mightypork.util.control.eventbus.clients.ClientHub;
-import mightypork.util.logging.Log;
 
 
 public abstract class LayoutComponent extends VisualComponent implements Enableable, ClientHub, AppAccess {
diff --git a/src/mightypork/rogue/App.java b/src/mightypork/rogue/App.java
index 8a9c040..ece7616 100644
--- a/src/mightypork/rogue/App.java
+++ b/src/mightypork/rogue/App.java
@@ -22,11 +22,12 @@ import mightypork.rogue.screens.main_menu.ScreenMainMenu;
 import mightypork.rogue.screens.test_bouncyboxes.ScreenTestBouncy;
 import mightypork.rogue.screens.test_cat_sound.ScreenTestCat;
 import mightypork.rogue.screens.test_render.ScreenTestRender;
-import mightypork.rogue.world.LocalPlayer;
+import mightypork.rogue.world.PlayerInfo;
 import mightypork.rogue.world.World;
 import mightypork.rogue.world.WorldPos;
 import mightypork.rogue.world.item.Item;
-import mightypork.rogue.world.map.LevelMap;
+import mightypork.rogue.world.map.Level;
+import mightypork.rogue.world.structs.LevelList;
 import mightypork.rogue.world.tile.Tile;
 import mightypork.util.control.eventbus.EventBus;
 import mightypork.util.control.eventbus.events.Event;
@@ -110,8 +111,9 @@ public final class App extends BaseApp {
 	protected void preInit()
 	{
 		Ion.registerIonizable(Item.ION_MARK, Item.class);
-		Ion.registerIonizable(LevelMap.ION_MARK, LevelMap.class);
-		Ion.registerIonizable(LocalPlayer.ION_MARK, LocalPlayer.class);
+		Ion.registerIonizable(Level.ION_MARK, Level.class);
+		Ion.registerIonizable(LevelList.ION_MARK, LevelList.class);
+		Ion.registerIonizable(PlayerInfo.ION_MARK, PlayerInfo.class);
 		Ion.registerIonizable(Tile.ION_MARK, Tile.class);
 		Ion.registerIonizable(World.ION_MARK, World.class);
 		Ion.registerIonizable(WorldPos.ION_MARK, WorldPos.class);
diff --git a/src/mightypork/rogue/screens/ingame/GameGui.java b/src/mightypork/rogue/screens/ingame/GameGui.java
index 4c8ffd0..6728abe 100644
--- a/src/mightypork/rogue/screens/ingame/GameGui.java
+++ b/src/mightypork/rogue/screens/ingame/GameGui.java
@@ -2,23 +2,17 @@ package mightypork.rogue.screens.ingame;
 
 
 import mightypork.gamecore.gui.AlignX;
-import mightypork.gamecore.gui.components.Component;
 import mightypork.gamecore.gui.components.layout.HorizontalFixedFlowLayout;
 import mightypork.gamecore.gui.components.painters.ImagePainter;
-import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.screens.Screen;
 import mightypork.gamecore.gui.screens.ScreenLayer;
-import mightypork.gamecore.render.Render;
 import mightypork.rogue.Res;
 import mightypork.util.constraints.num.Num;
 import mightypork.util.constraints.rect.Rect;
-import mightypork.util.math.color.PAL16;
-import mightypork.util.math.color.RGB;
 
 
 public class GameGui extends ScreenLayer {
 	
-
 	public GameGui(Screen screen)
 	{
 		super(screen);
@@ -26,7 +20,7 @@ public class GameGui extends ScreenLayer {
 		final Num h = root.height();
 		final Num w = root.width();
 		final Num minWH = w.min(h).max(700); // avoid too small shrinking
-				
+		
 		final ImagePainter nav = new ImagePainter(Res.getTxQuad("panel"));
 		nav.setRect(root.bottomEdge().growUp(minWH.perc(7)));
 		root.add(nav);
@@ -59,11 +53,11 @@ public class GameGui extends ScreenLayer {
 		return 100;
 	}
 	
+	
 	@Override
 	public void render()
 	{
 		
-		
 		super.render();
 	}
 	
diff --git a/src/mightypork/rogue/screens/ingame/ScreenGame.java b/src/mightypork/rogue/screens/ingame/ScreenGame.java
index 157e670..e9c90db 100644
--- a/src/mightypork/rogue/screens/ingame/ScreenGame.java
+++ b/src/mightypork/rogue/screens/ingame/ScreenGame.java
@@ -10,7 +10,7 @@ public class ScreenGame extends LayeredScreen {
 	public ScreenGame(AppAccess app)
 	{
 		super(app);
-
+		
 		addLayer(new WorldLayer(this)); //TODO with provided world
 		addLayer(new GameGui(this));
 	}
diff --git a/src/mightypork/rogue/screens/ingame/WorldLayer.java b/src/mightypork/rogue/screens/ingame/WorldLayer.java
index c0c9422..577bb15 100644
--- a/src/mightypork/rogue/screens/ingame/WorldLayer.java
+++ b/src/mightypork/rogue/screens/ingame/WorldLayer.java
@@ -1,12 +1,14 @@
 package mightypork.rogue.screens.ingame;
 
 
+import java.io.IOException;
 import java.util.Random;
 
 import mightypork.gamecore.gui.screens.Screen;
 import mightypork.gamecore.gui.screens.ScreenLayer;
 import mightypork.rogue.world.MapGenerator;
 import mightypork.rogue.world.World;
+import mightypork.util.files.ion.Ion;
 
 
 public class WorldLayer extends ScreenLayer {
@@ -15,14 +17,20 @@ public class WorldLayer extends ScreenLayer {
 	{
 		super(screen);
 		
-		Random rand = new Random();
-		World w = MapGenerator.createWorld(rand.nextLong());
+		final Random rand = new Random();
+		final World w = MapGenerator.createWorld(rand.nextLong());
+		try {
+			Ion.toFile("amap.ion", w);
+		} catch (final IOException e) {
+			e.printStackTrace();
+		}
 		
-		WorldRenderer wr = new WorldRenderer(w);
+		final WorldRenderer wr = new WorldRenderer(w);
 		wr.setRect(root);
 		root.add(wr);
 	}
 	
+	
 	@Override
 	public int getPriority()
 	{
diff --git a/src/mightypork/rogue/screens/ingame/WorldRenderer.java b/src/mightypork/rogue/screens/ingame/WorldRenderer.java
index b196b9b..524c84f 100644
--- a/src/mightypork/rogue/screens/ingame/WorldRenderer.java
+++ b/src/mightypork/rogue/screens/ingame/WorldRenderer.java
@@ -8,7 +8,6 @@ import mightypork.rogue.world.World;
 import mightypork.util.constraints.num.Num;
 import mightypork.util.constraints.rect.Rect;
 import mightypork.util.control.timing.Updateable;
-import mightypork.util.math.color.PAL16;
 import mightypork.util.math.color.RGB;
 
 
@@ -28,9 +27,9 @@ public class WorldRenderer extends InputComponent implements Updateable {
 		final Num h = height();
 		final Num w = width();
 		final Num minWH = w.min(h).max(700);
-				
-		Num grX = w.perc(30);
-		Num grY = h.perc(20);
+		
+		final Num grX = w.perc(30);
+		final Num grY = h.perc(20);
 		
 		leftShadow = leftEdge().growRight(grX);
 		rightShadow = rightEdge().growLeft(grX);
@@ -48,7 +47,7 @@ public class WorldRenderer extends InputComponent implements Updateable {
 	
 	@Override
 	protected void renderComponent()
-	{		
+	{
 		world.render(this, 8, 6, 64);
 		
 		Render.quadGradH(leftShadow, RGB.BLACK, RGB.NONE);
diff --git a/src/mightypork/rogue/world/MapGenerator.java b/src/mightypork/rogue/world/MapGenerator.java
index 8ab3423..6f4a267 100644
--- a/src/mightypork/rogue/world/MapGenerator.java
+++ b/src/mightypork/rogue/world/MapGenerator.java
@@ -3,7 +3,7 @@ package mightypork.rogue.world;
 
 import java.util.Random;
 
-import mightypork.rogue.world.map.LevelMap;
+import mightypork.rogue.world.map.Level;
 import mightypork.rogue.world.tile.Tiles;
 
 
@@ -17,31 +17,32 @@ public class MapGenerator {
 		synchronized (rand) {
 			rand.setSeed(seed);
 			
-			World w = new World();
+			final World w = new World();
 			w.setSeed(seed);
 			
-			int levels = 4 + rand.nextInt(6);
+			final int levels = 4 + rand.nextInt(6);
 			
 			for (int i = 0; i < levels; i++) {
 				w.addLevel(createLevel(rand.nextLong()));
 			}
 			
 			// TODO place on start position
-			w.setPlayer(new LocalPlayer(10, 10, 0));
-			return w;	
+			w.setPlayer(new PlayerInfo(10, 10, 0));
+			return w;
 		}
 	}
 	
 	
-	private static LevelMap createLevel(long seed)
+	private static Level createLevel(long seed)
 	{
 		// TODO
 		
-		LevelMap lm = new LevelMap(20, 20);
+		final Level lm = new Level(20, 20);
+		lm.setSeed(seed);
 		
 		lm.fill(Tiles.CRYSTAL_FLOOR);
 		
-		Random rand = new Random();
+		final Random rand = new Random();
 		rand.setSeed(seed);
 		
 		for (int i = 0; i < 150; i++) {
diff --git a/src/mightypork/rogue/world/LocalPlayer.java b/src/mightypork/rogue/world/PlayerInfo.java
similarity index 79%
rename from src/mightypork/rogue/world/LocalPlayer.java
rename to src/mightypork/rogue/world/PlayerInfo.java
index 447424d..d4cb16f 100644
--- a/src/mightypork/rogue/world/LocalPlayer.java
+++ b/src/mightypork/rogue/world/PlayerInfo.java
@@ -16,7 +16,7 @@ import mightypork.util.files.ion.Ionizable;
  * 
  * @author MightyPork
  */
-public class LocalPlayer implements Ionizable, MapObserver {
+public class PlayerInfo implements Ionizable, MapObserver {
 	
 	public static final short ION_MARK = 708;
 	
@@ -24,18 +24,18 @@ public class LocalPlayer implements Ionizable, MapObserver {
 	
 	
 	@IonConstructor
-	public LocalPlayer()
+	public PlayerInfo()
 	{
 	}
 	
 	
-	public LocalPlayer(int x, int y, int floor)
+	public PlayerInfo(int x, int y, int floor)
 	{
 		this.position.setTo(x, y, floor);
 	}
 	
 	
-	public LocalPlayer(WorldPos pos)
+	public PlayerInfo(WorldPos pos)
 	{
 		this.position = pos;
 	}
@@ -44,7 +44,7 @@ public class LocalPlayer implements Ionizable, MapObserver {
 	@Override
 	public void load(InputStream in) throws IOException
 	{
-		IonBundle ib = (IonBundle) Ion.readObject(in);
+		final IonBundle ib = (IonBundle) Ion.readObject(in);
 		
 		position = ib.get("pos", position);
 	}
@@ -53,7 +53,7 @@ public class LocalPlayer implements Ionizable, MapObserver {
 	@Override
 	public void save(OutputStream out) throws IOException
 	{
-		IonBundle ib = new IonBundle();
+		final IonBundle ib = new IonBundle();
 		
 		ib.put("pos", position);
 		
diff --git a/src/mightypork/rogue/world/World.java b/src/mightypork/rogue/world/World.java
index 0a538f8..70688c2 100644
--- a/src/mightypork/rogue/world/World.java
+++ b/src/mightypork/rogue/world/World.java
@@ -7,21 +7,18 @@ import java.io.OutputStream;
 import java.util.HashSet;
 import java.util.Set;
 
-import mightypork.gamecore.render.Render;
-import mightypork.rogue.world.map.LevelMap;
+import mightypork.rogue.world.map.Level;
 import mightypork.rogue.world.map.TileRenderContext;
 import mightypork.rogue.world.structs.LevelList;
 import mightypork.util.constraints.rect.Rect;
 import mightypork.util.constraints.rect.RectConst;
 import mightypork.util.constraints.rect.proxy.RectBound;
-import mightypork.util.constraints.vect.Vect;
 import mightypork.util.constraints.vect.VectConst;
 import mightypork.util.control.timing.Updateable;
 import mightypork.util.error.CorruptedDataException;
 import mightypork.util.files.ion.Ion;
 import mightypork.util.files.ion.IonBundle;
 import mightypork.util.files.ion.Ionizable;
-import mightypork.util.math.color.RGB;
 
 
 public class World implements Ionizable, Updateable {
@@ -30,10 +27,11 @@ public class World implements Ionizable, Updateable {
 	
 	private LevelList levels = new LevelList();
 	
-	private LocalPlayer player = new LocalPlayer();
+	private PlayerInfo player = new PlayerInfo();
 	
 	private transient final Set<MapObserver> observers = new HashSet<>();
 	
+	/** This seed can be used to re-create identical world. */
 	private long seed;
 	
 	
@@ -41,10 +39,10 @@ public class World implements Ionizable, Updateable {
 	public void load(InputStream in) throws IOException
 	{
 		// world data
-		IonBundle ib = (IonBundle) Ion.readObject(in);
+		final IonBundle ib = (IonBundle) Ion.readObject(in);
 		player = ib.get("player", player);
-		levels = ib.get("levels", levels);
 		seed = ib.get("seed", seed);
+		levels = ib.get("levels", levels);
 		
 		// levels
 		Ion.readSequence(in, levels);
@@ -56,14 +54,15 @@ public class World implements Ionizable, Updateable {
 	@Override
 	public void save(OutputStream out) throws IOException
 	{
-		IonBundle ib = new IonBundle();
+		final IonBundle ib = new IonBundle();
 		ib.put("player", player);
-		ib.put("levels", levels);
 		ib.put("seed", seed);
+		ib.put("levels", levels);
+		Ion.writeObject(out, ib);
 	}
 	
 	
-	public void setPlayer(LocalPlayer player)
+	public void setPlayer(PlayerInfo player)
 	{
 		removeObserver(this.player);
 		
@@ -85,7 +84,7 @@ public class World implements Ionizable, Updateable {
 	}
 	
 	
-	public void addLevel(LevelMap level)
+	public void addLevel(Level level)
 	{
 		levels.add(level);
 	}
@@ -102,7 +101,7 @@ public class World implements Ionizable, Updateable {
 	public void update(double delta)
 	{
 		for (int level = 0; level < levels.size(); level++) {
-			for (MapObserver observer : observers) {
+			for (final MapObserver observer : observers) {
 				if (observer.getPosition().floor == level) {
 					levels.get(level).update(observer, delta);
 				}
@@ -111,7 +110,7 @@ public class World implements Ionizable, Updateable {
 	}
 	
 	
-	public LevelMap getLevelForObserver(MapObserver observer)
+	public Level getLevelForObserver(MapObserver observer)
 	{
 		return levels.get(observer.getPosition().floor);
 	}
@@ -127,28 +126,28 @@ public class World implements Ionizable, Updateable {
 	 */
 	public void render(final RectBound viewport, final int yTiles, final int xTiles, final int minSize)
 	{
-		LevelMap floor = getLevelForObserver(player); // TODO fractional movement
+		final Level floor = getLevelForObserver(player); // TODO fractional movement
 		
-		Rect r = viewport.getRect();
-		double vpH = r.height().value();
-		double vpW = r.width().value();
+		final Rect r = viewport.getRect();
+		final double vpH = r.height().value();
+		final double vpW = r.width().value();
 		
 		// adjust tile size to fit desired amount of tiles
 		
-		double allowedSizeW = vpW / xTiles;
-		double allowedSizeH = vpH / yTiles;
+		final double allowedSizeW = vpW / xTiles;
+		final double allowedSizeH = vpH / yTiles;
 		int tileSize = (int) Math.round(Math.max(Math.min(allowedSizeH, allowedSizeW), minSize));
 		
 		tileSize -= tileSize % 16;
 		
-		VectConst vpCenter = r.center().sub(tileSize * 0.5, tileSize).freeze(); // 0.5 to center, 1 to move up (down is teh navbar)
+		final VectConst vpCenter = r.center().sub(tileSize * 0.5, tileSize).freeze(); // 0.5 to center, 1 to move up (down is teh navbar)
 		
-		int playerX = player.getPosition().x;
-		int playerY = player.getPosition().y;
+		final int playerX = player.getPosition().x;
+		final int playerY = player.getPosition().y;
 		
 		// total map area
 		//@formatter:off
-		RectConst mapRect = vpCenter.startRect().grow(
+		final RectConst mapRect = vpCenter.startRect().grow(
 				playerX*tileSize,
 				playerY*tileSize,//
 				(floor.getWidth() - playerX) * tileSize,
@@ -157,12 +156,12 @@ public class World implements Ionizable, Updateable {
 		//@formatter:on
 		
 		// tiles to render
-		int x1 = (int) Math.floor(playerX - (vpW / tileSize));
-		int y1 = (int) Math.floor(playerY - (vpH / tileSize));
-		int x2 = (int) Math.ceil(playerX + (vpW / tileSize));
-		int y2 = (int) Math.ceil(playerY + (vpH / tileSize));
+		final int x1 = (int) Math.floor(playerX - (vpW / tileSize));
+		final int y1 = (int) Math.floor(playerY - (vpH / tileSize));
+		final int x2 = (int) Math.ceil(playerX + (vpW / tileSize));
+		final int y2 = (int) Math.ceil(playerY + (vpH / tileSize));
 		
-		TileRenderContext trc = new TileRenderContext(floor, mapRect); //-tileSize*0.5
+		final TileRenderContext trc = new TileRenderContext(floor, mapRect); //-tileSize*0.5
 		for (trc.y = y1; trc.y <= y2; trc.y++) {
 			for (trc.x = x1; trc.x <= x2; trc.x++) {
 				trc.render();
diff --git a/src/mightypork/rogue/world/map/LevelMap.java b/src/mightypork/rogue/world/map/Level.java
similarity index 77%
rename from src/mightypork/rogue/world/map/LevelMap.java
rename to src/mightypork/rogue/world/map/Level.java
index a0be413..9abf446 100644
--- a/src/mightypork/rogue/world/map/LevelMap.java
+++ b/src/mightypork/rogue/world/map/Level.java
@@ -13,7 +13,6 @@ import mightypork.rogue.world.tile.Tiles;
 import mightypork.util.files.ion.Ion;
 import mightypork.util.files.ion.IonConstructor;
 import mightypork.util.files.ion.Ionizable;
-import mightypork.util.logging.Log;
 
 
 /**
@@ -21,7 +20,7 @@ import mightypork.util.logging.Log;
  * 
  * @author MightyPork
  */
-public class LevelMap implements MapAccess, Ionizable {
+public class Level implements MapAccess, Ionizable {
 	
 	public static final int ION_MARK = 702;
 	
@@ -35,12 +34,12 @@ public class LevelMap implements MapAccess, Ionizable {
 	
 	
 	@IonConstructor
-	public LevelMap()
+	public Level()
 	{
 	}
 	
 	
-	public LevelMap(int width, int height)
+	public Level(int width, int height)
 	{
 		this.width = width;
 		this.height = height;
@@ -56,7 +55,7 @@ public class LevelMap implements MapAccess, Ionizable {
 	}
 	
 	
-	public void fill(int id)
+	public void fill(short id)
 	{
 		fill(Tiles.get(id));
 	}
@@ -131,19 +130,17 @@ public class LevelMap implements MapAccess, Ionizable {
 	@Override
 	public void load(InputStream in) throws IOException
 	{
+		seed = Ion.readLong(in);
 		width = Ion.readInt(in);
 		height = Ion.readInt(in);
 		
 		buildArray();
 		
-		while (Ion.hasNextEntry(in)) {
-			
-			final int x = Ion.readInt(in);
-			final int y = Ion.readInt(in);
-			
-			final Tile tile = (Tile) Ion.readObject(in);
-			
-			setTile(tile, x, y);
+		for (int y = 0; y < height; y++) {
+			for (int x = 0; x < width; x++) {
+				tiles[y][x] = new Tile();
+				tiles[y][x].load(in);
+			}
 		}
 	}
 	
@@ -151,24 +148,15 @@ public class LevelMap implements MapAccess, Ionizable {
 	@Override
 	public void save(OutputStream out) throws IOException
 	{
+		Ion.writeLong(out, seed);
 		Ion.writeInt(out, width);
 		Ion.writeInt(out, height);
 		
-		for (int x = 0; x < width; x++) {
-			for (int y = 0; y < height; y++) {
-				final Tile t = getTile(x, y);
-				// skip null tiles
-				if (!t.getModel().isNullTile()) {
-					Ion.writeMark(out, Ion.ENTRY);
-					Ion.writeInt(out, x);
-					Ion.writeInt(out, y);
-					Ion.writeObject(out, t);
-				}
+		for (int y = 0; y < height; y++) {
+			for (int x = 0; x < width; x++) {
+				tiles[y][x].save(out);
 			}
 		}
-		
-		// end of sequence
-		Ion.writeMark(out, Ion.END);
 	}
 	
 	
@@ -181,8 +169,8 @@ public class LevelMap implements MapAccess, Ionizable {
 	
 	public void update(MapObserver observer, double delta)
 	{
-		int viewRange = observer.getViewRange();
-		WorldPos position = observer.getPosition();
+		final int viewRange = observer.getViewRange();
+		final WorldPos position = observer.getPosition();
 		
 		int x1 = position.x - viewRange;
 		int y1 = position.y - viewRange;
diff --git a/src/mightypork/rogue/world/structs/LevelList.java b/src/mightypork/rogue/world/structs/LevelList.java
index aee42a3..4f8012d 100644
--- a/src/mightypork/rogue/world/structs/LevelList.java
+++ b/src/mightypork/rogue/world/structs/LevelList.java
@@ -1,14 +1,15 @@
 package mightypork.rogue.world.structs;
 
 
-import mightypork.rogue.world.map.LevelMap;
+import mightypork.rogue.world.map.Level;
 import mightypork.util.files.ion.templates.IonizableArrayList;
 
 
-public class LevelList extends IonizableArrayList<LevelMap> {
+public class LevelList extends IonizableArrayList<Level> {
 	
 	public static final short ION_MARK = 709;
 	
+	
 	@Override
 	public short getIonMark()
 	{
diff --git a/src/mightypork/rogue/world/tile/Tile.java b/src/mightypork/rogue/world/tile/Tile.java
index 14e0238..baa7491 100644
--- a/src/mightypork/rogue/world/tile/Tile.java
+++ b/src/mightypork/rogue/world/tile/Tile.java
@@ -4,14 +4,12 @@ package mightypork.rogue.world.tile;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.Stack;
 
-import mightypork.rogue.world.item.Item;
 import mightypork.rogue.world.map.TileRenderContext;
+import mightypork.rogue.world.structs.ItemStack;
 import mightypork.util.control.timing.Animator;
 import mightypork.util.control.timing.Updateable;
 import mightypork.util.files.ion.Ion;
-import mightypork.util.files.ion.IonBundle;
 import mightypork.util.files.ion.IonConstructor;
 import mightypork.util.files.ion.Ionizable;
 
@@ -26,7 +24,7 @@ public final class Tile implements Ionizable, Updateable {
 	
 	public int id;
 	
-	public Stack<Item> items = new Stack<>();
+	public ItemStack items = new ItemStack();
 	
 	public boolean[] flags;
 	public int[] numbers;
@@ -66,30 +64,30 @@ public final class Tile implements Ionizable, Updateable {
 	{
 		if (model.isNullTile()) throw new RuntimeException("Cannot save null tile.");
 		
-		final IonBundle ib = new IonBundle();
+		Ion.writeShort(out, (short) id);
 		
-		ib.put("id", id);
-		ib.put("flags", flags);
-		ib.put("numbers", numbers);
+		byte written = 0;
+		if (flags != null) written |= 1;
+		if (numbers != null) written |= 2;
+		if (items != null && !items.isEmpty()) written |= 4;
+		Ion.writeByte(out, written);
 		
-		Ion.writeSequence(out, items);
-		
-		Ion.writeObject(out, ib);
+		if ((written & 1) != 0) Ion.writeBooleanArray(out, flags);
+		if ((written & 2) != 0) Ion.writeIntArray(out, numbers);
+		if ((written & 4) != 0) Ion.writeObject(out, items);
 	}
 	
 	
 	@Override
 	public void load(InputStream in) throws IOException
 	{
-		// bundle of data
-		final IonBundle ib = (IonBundle) Ion.readObject(in);
-		id = ib.get("id", id);
-		flags = ib.get("flags", flags);
-		numbers = ib.get("numbers", numbers);
+		id = Ion.readShort(in);
+		
+		final byte written = Ion.readByte(in);
 		
-		// stored items
-		items.clear();
-		Ion.readSequence(in, items);
+		if ((written & 1) != 0) flags = Ion.readBooleanArray(in);
+		if ((written & 2) != 0) numbers = Ion.readIntArray(in);
+		if ((written & 4) != 0) items = (ItemStack) Ion.readObject(in);
 		
 		// renew model
 		if (model == null || id != model.id) {
diff --git a/src/mightypork/rogue/world/tile/models/SimpleTile.java b/src/mightypork/rogue/world/tile/models/SimpleTile.java
index d18a27e..9227d35 100644
--- a/src/mightypork/rogue/world/tile/models/SimpleTile.java
+++ b/src/mightypork/rogue/world/tile/models/SimpleTile.java
@@ -1,7 +1,6 @@
 package mightypork.rogue.world.tile.models;
 
 
-import mightypork.gamecore.render.DisplaySystem;
 import mightypork.gamecore.render.Render;
 import mightypork.gamecore.render.textures.TxSheet;
 import mightypork.rogue.Res;
@@ -9,8 +8,6 @@ import mightypork.rogue.world.map.TileRenderContext;
 import mightypork.rogue.world.tile.Tile;
 import mightypork.rogue.world.tile.TileModel;
 import mightypork.util.annotations.DefaultImpl;
-import mightypork.util.constraints.vect.Vect;
-import mightypork.util.math.color.RGB;
 
 
 public abstract class SimpleTile extends TileModel {
@@ -31,6 +28,7 @@ public abstract class SimpleTile extends TileModel {
 		Render.quadTextured(context.getRect(), sheet.getRandomQuad(context.getTileNoise()));
 	}
 	
+	
 	@Override
 	@DefaultImpl
 	public void update(Tile tile, double delta)
diff --git a/src/mightypork/util/constraints/rect/Rect.java b/src/mightypork/util/constraints/rect/Rect.java
index b9088d8..625d537 100644
--- a/src/mightypork/util/constraints/rect/Rect.java
+++ b/src/mightypork/util/constraints/rect/Rect.java
@@ -725,7 +725,6 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 			
 		};
 	}
-
 	
 	
 	/**
@@ -756,7 +755,6 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 			
 		};
 	}
-
 	
 	
 	/**
@@ -789,7 +787,6 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 	}
 	
 	
-	
 	public Num x()
 	{
 		return p_x != null ? p_x : (p_x = origin().xn());
@@ -1048,5 +1045,5 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 		//      overflow || intersect
 		return ((rw < rx || rw > tx) && (rh < ry || rh > ty) && (tw < tx || tw > rx) && (th < ty || th > ry));
 	}
-
+	
 }
diff --git a/src/mightypork/util/error/CorruptedDataException.java b/src/mightypork/util/error/CorruptedDataException.java
index 2a3f0e4..134fd41 100644
--- a/src/mightypork/util/error/CorruptedDataException.java
+++ b/src/mightypork/util/error/CorruptedDataException.java
@@ -1,5 +1,6 @@
 package mightypork.util.error;
 
+
 import java.io.IOException;
 
 
diff --git a/src/mightypork/util/files/ion/Ion.java b/src/mightypork/util/files/ion/Ion.java
index ea2d985..474a9d0 100644
--- a/src/mightypork/util/files/ion/Ion.java
+++ b/src/mightypork/util/files/ion/Ion.java
@@ -3,9 +3,13 @@ package mightypork.util.files.ion;
 
 import java.io.*;
 import java.nio.ByteBuffer;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Map.Entry;
 
+import mightypork.rogue.world.tile.Tile;
 import mightypork.util.error.CorruptedDataException;
 import mightypork.util.logging.Log;
 
@@ -403,11 +407,17 @@ public class Ion {
 	 */
 	public static void writeObject(OutputStream out, Object obj) throws IOException
 	{
+		if (obj instanceof Tile) throw new IllegalAccessError();
+		if (obj == null) {
+			writeMark(out, NULL);
+			return;
+		}
+		
 		if (obj instanceof Ionizable) {
 			
-			short mark = ((Ionizable) obj).getIonMark();
+			final short mark = ((Ionizable) obj).getIonMark();
 			
-			Class<? extends Ionizable> clzRegistered = customIonizables.get(mark);
+			final Class<? extends Ionizable> clzRegistered = customIonizables.get(mark);
 			
 			if (clzRegistered == null) {
 				throw new IOException("Ionizable object not registered: " + Log.str(obj.getClass()));
@@ -1292,6 +1302,10 @@ public class Ion {
 	public static <K, V> void writeMap(OutputStream out, Map<K, V> map) throws IOException
 	{
 		for (final Entry<K, V> e : map.entrySet()) {
+			if (e.getValue() == null) {
+				continue;
+			}
+			
 			writeMark(out, ENTRY);
 			writeObject(out, e.getKey());
 			writeObject(out, e.getValue());
diff --git a/src/mightypork/util/files/ion/IonBundle.java b/src/mightypork/util/files/ion/IonBundle.java
index 31174ff..5fca8e0 100644
--- a/src/mightypork/util/files/ion/IonBundle.java
+++ b/src/mightypork/util/files/ion/IonBundle.java
@@ -1,5 +1,6 @@
 package mightypork.util.files.ion;
 
+
 import mightypork.util.files.ion.templates.IonizableHashMap;
 
 
diff --git a/src/mightypork/util/logging/Log.java b/src/mightypork/util/logging/Log.java
index 8f6e86b..1148e05 100644
--- a/src/mightypork/util/logging/Log.java
+++ b/src/mightypork/util/logging/Log.java
@@ -337,6 +337,8 @@ public class Log {
 	public static String str(Object o)
 	{
 		
+		if (o == null) return "<null>";
+		
 		boolean hasToString = false;
 		
 		try {