diff --git a/src/mightypork/gamecore/render/DisplaySystem.java b/src/mightypork/gamecore/render/DisplaySystem.java
index b00e0ad..dfe3475 100644
--- a/src/mightypork/gamecore/render/DisplaySystem.java
+++ b/src/mightypork/gamecore/render/DisplaySystem.java
@@ -32,7 +32,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 	private FpsMeter fpsMeter;
 	
 	/** Current screen size */
-	private final Vect screenSize = new Vect() {
+	private static final Vect screenSize = new Vect() {
 		
 		@Override
 		public double y()
@@ -48,7 +48,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 		}
 	};
 	
-	private final Rect rect = Rect.make(screenSize);
+	private static final Rect rect = Rect.make(screenSize);
 	
 	
 	/**
@@ -168,7 +168,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 	/**
 	 * @return true if close was requested (i.e. click on cross)
 	 */
-	public boolean isCloseRequested()
+	public static boolean isCloseRequested()
 	{
 		return Display.isCloseRequested();
 	}
@@ -179,7 +179,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 	 * 
 	 * @return is fullscreen
 	 */
-	public boolean isFullscreen()
+	public static boolean isFullscreen()
 	{
 		return Display.isFullscreen();
 	}
@@ -190,16 +190,27 @@ public class DisplaySystem extends AppModule implements RectBound {
 	 * 
 	 * @return size
 	 */
-	public Vect getSize()
+	public static Vect getSize()
 	{
 		return screenSize;
 	}
 	
 	
+	/**
+	 * Get screen rect. Static version of getRect().
+	 * 
+	 * @return size
+	 */
+	public static Rect getBounds()
+	{
+		return rect;
+	}
+	
+	
 	/**
 	 * @return screen width
 	 */
-	public int getWidth()
+	public static int getWidth()
 	{
 		return screenSize.xi();
 	}
@@ -208,7 +219,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 	/**
 	 * @return screen height
 	 */
-	public int getHeight()
+	public static int getHeight()
 	{
 		return screenSize.yi();
 	}
@@ -246,7 +257,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 	@Override
 	public Rect getRect()
 	{
-		return rect;
+		return getBounds();
 	}
 	
 	
@@ -264,7 +275,7 @@ public class DisplaySystem extends AppModule implements RectBound {
 	 * 
 	 * @return screen center.
 	 */
-	public Vect getCenter()
+	public static Vect getCenter()
 	{
 		return rect.center();
 	}
diff --git a/src/mightypork/rogue/App.java b/src/mightypork/rogue/App.java
index 4830170..306aa74 100644
--- a/src/mightypork/rogue/App.java
+++ b/src/mightypork/rogue/App.java
@@ -24,7 +24,9 @@ import mightypork.rogue.screens.test_cat_sound.ScreenTestCat;
 import mightypork.rogue.screens.test_render.ScreenTestRender;
 import mightypork.rogue.world.WorldMap;
 import mightypork.rogue.world.item.Item;
+import mightypork.rogue.world.item.ItemData;
 import mightypork.rogue.world.tile.Tile;
+import mightypork.rogue.world.tile.TileData;
 import mightypork.util.control.eventbus.EventBus;
 import mightypork.util.control.eventbus.events.Event;
 import mightypork.util.files.ion.Ion;
@@ -106,9 +108,11 @@ public final class App extends BaseApp {
 	@Override
 	protected void preInit()
 	{
-		Ion.registerIonizable(Tile.ION_MARK, Tile.class);
-		Ion.registerIonizable(Item.ION_MARK, Item.class);
-		Ion.registerIonizable(WorldMap.ION_MARK, WorldMap.class);
+		Ion.registerIonizable(Tile.ION_MARK, Tile.class); // 700
+		Ion.registerIonizable(Item.ION_MARK, Item.class); // 701
+		Ion.registerIonizable(WorldMap.ION_MARK, WorldMap.class); // 702
+		Ion.registerIonizable(TileData.ION_MARK, TileData.class); // 703
+		Ion.registerIonizable(ItemData.ION_MARK, ItemData.class); // 704
 	}
 	
 	
diff --git a/src/mightypork/rogue/Res.java b/src/mightypork/rogue/Res.java
index ae24ce8..319ae4c 100644
--- a/src/mightypork/rogue/Res.java
+++ b/src/mightypork/rogue/Res.java
@@ -70,17 +70,18 @@ public final class Res {
 		QuadGrid gui = texture.grid(4, 4);
 		textures.addQuad("item_frame", gui.makeQuad(0, 0));
 		textures.addQuad("sword", gui.makeQuad(1, 0));
-		textures.addQuad("meat", gui.makeQuad(2, 0));		
+		textures.addQuad("meat", gui.makeQuad(2, 0));
 		textures.addQuad("heart_on", gui.makeQuad(.0, 1, .5, .5));
-		textures.addQuad("heart_off", gui.makeQuad(.5, 1, .5, .5));		
+		textures.addQuad("heart_off", gui.makeQuad(.5, 1, .5, .5));
 		textures.addQuad("xp_on", gui.makeQuad(0, 1.5, .5, .5));
-		textures.addQuad("xp_off", gui.makeQuad(.5, 1.5, .5, .5));		
+		textures.addQuad("xp_off", gui.makeQuad(.5, 1.5, .5, .5));
 		textures.addQuad("panel", gui.makeQuad(0, 3.75, 4, .25));
-
+		
 		texture = textures.loadTexture("tiles", "/res/img/map_tiles.png", FilterMode.NEAREST, WrapMode.CLAMP);
 		QuadGrid tiles = texture.grid(32, 32);
 		
-		
+		textures.addSheet("tile.mossy_bricks.wall", tiles.makeSheet(4, 0, 7, 1));
+		textures.addSheet("tile.mossy_bricks.floor", tiles.makeSheet(16, 5, 7, 1));
 	}
 	
 	
@@ -104,6 +105,12 @@ public final class Res {
 	}
 	
 	
+	public static TxSheet getTxSheet(String key)
+	{
+		return textures.getSheet(key);
+	}
+	
+	
 	public static LoopPlayer getLoop(String key)
 	{
 		return sounds.getLoop(key);
diff --git a/src/mightypork/rogue/world/EntityModel.java b/src/mightypork/rogue/world/EntityModel.java
index 4e147a0..034f872 100644
--- a/src/mightypork/rogue/world/EntityModel.java
+++ b/src/mightypork/rogue/world/EntityModel.java
@@ -54,27 +54,6 @@ public abstract class EntityModel<D, R extends RectBound> {
 	public abstract D createData();
 	
 	
-	/**
-	 * Load an entity from ION input stream.
-	 * 
-	 * @param data data to load
-	 * @param in input stream
-	 * @throws IOException
-	 */
-	public abstract void load(D data, InputStream in) throws IOException;
-	
-	
-	/**
-	 * Save an entity to ION output stream.
-	 * 
-	 * @param data data to save
-	 * @param out output stream
-	 * @throws IOException
-	 */
-	@DefaultImpl
-	public abstract void save(D data, OutputStream out) throws IOException;
-	
-	
 	/**
 	 * Render the item according to given context.
 	 * 
diff --git a/src/mightypork/rogue/world/WorldMap.java b/src/mightypork/rogue/world/WorldMap.java
index 48289c8..dc11685 100644
--- a/src/mightypork/rogue/world/WorldMap.java
+++ b/src/mightypork/rogue/world/WorldMap.java
@@ -6,12 +6,12 @@ import java.io.InputStream;
 import java.io.OutputStream;
 
 import mightypork.rogue.world.tile.Tile;
-import mightypork.rogue.world.tile.TileHolder;
+import mightypork.rogue.world.tile.TileGrid;
 import mightypork.util.files.ion.Ion;
 import mightypork.util.files.ion.Ionizable;
 
 
-public class WorldMap implements TileHolder, Ionizable {
+public class WorldMap implements TileGrid, Ionizable {
 	
 	public static final int ION_MARK = 702;
 	
diff --git a/src/mightypork/rogue/world/item/ItemData.java b/src/mightypork/rogue/world/item/ItemData.java
index dc65a38..dca443d 100644
--- a/src/mightypork/rogue/world/item/ItemData.java
+++ b/src/mightypork/rogue/world/item/ItemData.java
@@ -6,6 +6,8 @@ package mightypork.rogue.world.item;
  * 
  * @author MightyPork
  */
-public abstract class ItemData {
+public final class ItemData {
+
+	public static final int ION_MARK = 704;	
 	
 }
diff --git a/src/mightypork/rogue/world/tile/TileData.java b/src/mightypork/rogue/world/tile/TileData.java
index 27d7774..bf0be49 100644
--- a/src/mightypork/rogue/world/tile/TileData.java
+++ b/src/mightypork/rogue/world/tile/TileData.java
@@ -1,9 +1,14 @@
 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.util.files.ion.IonList;
+import mightypork.util.files.ion.Ionizable;
 
 
 /**
@@ -11,9 +16,39 @@ import mightypork.rogue.world.item.Item;
  * 
  * @author MightyPork
  */
-public abstract class TileData {
+public final class TileData implements Ionizable {
+	
+	public static final short ION_MARK = 703;
 	
 	/** Items dropped onto this tile */
-	public final Stack<Item> items = new Stack<>();
+	public final Stack<Item> items = new Stack<>();	
+	
+	public int id;
+	
+	public boolean[] flags;
+	public int[] numbers;
+	
+	
+	@Override
+	public void loadFrom(InputStream in) throws IOException
+	{
+		
+	}
+	
+	@Override
+	public void saveTo(OutputStream out) throws IOException
+	{
+	}
+	
+	@Override
+	public short getIonMark()
+	{
+		return 0;
+	}
+	
+	public Tile toTile() {
+		Tile t = new Tile(Tiles.get(id));
+		t.s
+	}
 	
 }
diff --git a/src/mightypork/rogue/world/tile/TileHolder.java b/src/mightypork/rogue/world/tile/TileGrid.java
similarity index 79%
rename from src/mightypork/rogue/world/tile/TileHolder.java
rename to src/mightypork/rogue/world/tile/TileGrid.java
index 30f470a..960094c 100644
--- a/src/mightypork/rogue/world/tile/TileHolder.java
+++ b/src/mightypork/rogue/world/tile/TileGrid.java
@@ -1,7 +1,7 @@
 package mightypork.rogue.world.tile;
 
 
-public interface TileHolder {
+public interface TileGrid {
 	
 	Tile getTile(int x, int y);
 	
diff --git a/src/mightypork/rogue/world/tile/TileModel.java b/src/mightypork/rogue/world/tile/TileModel.java
index 299319a..e3b6584 100644
--- a/src/mightypork/rogue/world/tile/TileModel.java
+++ b/src/mightypork/rogue/world/tile/TileModel.java
@@ -25,7 +25,7 @@ public abstract class TileModel extends EntityModel<TileData, TileRenderContext>
 	 * 
 	 * @return can be walked through (if discovered / open)
 	 */
-	public abstract boolean isPotentiallyWalkable();
+	public abstract boolean isWalkable();
 	
 	
 	/**
diff --git a/src/mightypork/rogue/world/tile/TileRenderContext.java b/src/mightypork/rogue/world/tile/TileRenderContext.java
index 3cad57c..f6aa249 100644
--- a/src/mightypork/rogue/world/tile/TileRenderContext.java
+++ b/src/mightypork/rogue/world/tile/TileRenderContext.java
@@ -4,18 +4,22 @@ package mightypork.rogue.world.tile;
 import mightypork.util.constraints.rect.Rect;
 import mightypork.util.constraints.rect.builders.TiledRect;
 import mightypork.util.constraints.rect.proxy.RectBound;
+import mightypork.util.math.noise.NoiseGen;
 
 
 public final class TileRenderContext implements RectBound {
 	
-	private final TileHolder map;
+	private final TileGrid map;
 	private final TiledRect tiler;
-	private int x, y;
+	private final NoiseGen noise;
 	
+	public int x, y;
 	
-	public TileRenderContext(TileHolder map, Rect mapArea) {
+	
+	public TileRenderContext(TileGrid map, Rect drawArea, long renderNoiseSeed) {
 		this.map = map;
-		this.tiler = mapArea.tiles(map.getWidth(), map.getHeight());
+		this.tiler = drawArea.tiles(map.getWidth(), map.getHeight());
+		this.noise = new NoiseGen(0.2, 0, 0.5, 1, renderNoiseSeed);
 	}
 	
 	
@@ -36,4 +40,20 @@ public final class TileRenderContext implements RectBound {
 	{
 		return tiler.tile(x, y);
 	}
+	
+	
+	/**
+	 * @return per-coord noise value 0..1
+	 */
+	public double getNoise()
+	{
+		return noise.valueAt(x, y);
+	}
+	
+	
+	public void setCoord(int x, int y)
+	{
+		this.x = x;
+		this.y = y;
+	}
 }
diff --git a/src/mightypork/rogue/world/tile/impl/SimpleFloor.java b/src/mightypork/rogue/world/tile/impl/SimpleFloor.java
new file mode 100644
index 0000000..4edc21e
--- /dev/null
+++ b/src/mightypork/rogue/world/tile/impl/SimpleFloor.java
@@ -0,0 +1,15 @@
+package mightypork.rogue.world.tile.impl;
+
+public class SimpleFloor extends SimpleTile {
+
+	public SimpleFloor(int id, String sheetKey) {
+		super(id, sheetKey);
+	}
+
+	@Override
+	public boolean isWalkable()
+	{
+		return true;
+	}
+	
+}
diff --git a/src/mightypork/rogue/world/tile/impl/SimpleTile.java b/src/mightypork/rogue/world/tile/impl/SimpleTile.java
new file mode 100644
index 0000000..dfa8b58
--- /dev/null
+++ b/src/mightypork/rogue/world/tile/impl/SimpleTile.java
@@ -0,0 +1,71 @@
+package mightypork.rogue.world.tile.impl;
+
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import mightypork.gamecore.render.DisplaySystem;
+import mightypork.gamecore.render.Render;
+import mightypork.gamecore.render.textures.TxSheet;
+import mightypork.rogue.Res;
+import mightypork.rogue.world.tile.TileData;
+import mightypork.rogue.world.tile.TileModel;
+import mightypork.rogue.world.tile.TileRenderContext;
+import mightypork.util.annotations.DefaultImpl;
+
+
+public abstract class SimpleTile extends TileModel {
+	
+	private TxSheet sheet;
+	
+	
+	public SimpleTile(int id, String sheetKey) {
+		super(id);
+		this.sheet = Res.getTxSheet(sheetKey);
+	}
+	
+	
+	@Override
+	@DefaultImpl
+	public void load(TileData data, InputStream in) throws IOException
+	{
+		// do nothing
+	}
+	
+	
+	@Override
+	@DefaultImpl
+	public void save(TileData data, OutputStream out) throws IOException
+	{
+		// do nothing
+	}
+	
+	
+	@Override
+	public void render(TileData data, TileRenderContext context)
+	{
+		// TODO worldmap should take care of this and break the row drawing when it encounters end of screen etc
+		
+		// not in screen -> no draw
+		if (!context.getRect().intersectsWith(DisplaySystem.getBounds())) return;
+		
+		Render.quadTextured(context.getRect(), sheet.getRandomQuad(context.getNoise()));
+	}
+	
+	
+	@Override
+	@DefaultImpl
+	public void update(TileData item, double delta)
+	{
+		// do nothing
+	}
+	
+	@Override
+	@DefaultImpl
+	public boolean isWalkable(TileData data)
+	{
+		return isWalkable();
+	}
+	
+}
diff --git a/src/mightypork/rogue/world/tile/impl/SimpleWall.java b/src/mightypork/rogue/world/tile/impl/SimpleWall.java
new file mode 100644
index 0000000..277e146
--- /dev/null
+++ b/src/mightypork/rogue/world/tile/impl/SimpleWall.java
@@ -0,0 +1,16 @@
+package mightypork.rogue.world.tile.impl;
+
+
+public class SimpleWall extends SimpleTile {
+
+	public SimpleWall(int id, String sheetKey) {
+		super(id, sheetKey);
+	}
+
+	@Override
+	public boolean isWalkable()
+	{
+		return false;
+	}
+	
+}
diff --git a/src/mightypork/test/FakeTile.java b/src/mightypork/test/FakeTile.java
index 8f94d8d..19ab7cd 100644
--- a/src/mightypork/test/FakeTile.java
+++ b/src/mightypork/test/FakeTile.java
@@ -26,7 +26,7 @@ public class FakeTile extends TileModel {
 	
 	
 	@Override
-	public boolean isPotentiallyWalkable()
+	public boolean isWalkable()
 	{
 		return true;
 	}
diff --git a/src/mightypork/util/constraints/rect/Rect.java b/src/mightypork/util/constraints/rect/Rect.java
index 2790c40..1b81f5a 100644
--- a/src/mightypork/util/constraints/rect/Rect.java
+++ b/src/mightypork/util/constraints/rect/Rect.java
@@ -1,6 +1,5 @@
 package mightypork.util.constraints.rect;
 
-
 import mightypork.util.annotations.FactoryMethod;
 import mightypork.util.constraints.DigestCache;
 import mightypork.util.constraints.Digestable;
@@ -952,4 +951,37 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 	{
 		return new TiledRect(this, 1, rows);
 	}
+	
+
+	/**
+	 * Check for intersection
+	 * 
+	 * @param other other rect
+	 * @return true if they intersect
+	 * @see org.lwjgl.util.Rectangle
+	 */
+	public boolean intersectsWith(Rect other)
+	{
+		double tw = this.size().x();
+		double th = this.size().y();
+		double rw = other.size().x();
+		double rh = other.size().y();
+		
+		if (rw <= 0 || rh <= 0 || tw <= 0 || th <= 0) {
+			return false;
+		}
+		
+		double tx = this.origin().x();
+		double ty = this.origin().y();
+		double rx = other.origin().x();
+		double ry = other.origin().y();
+		
+		rw += rx;
+		rh += ry;
+		tw += tx;
+		th += ty;
+		
+		//      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/math/noise/NoiseGen.java b/src/mightypork/util/math/noise/NoiseGen.java
index f01688c..32081de 100644
--- a/src/mightypork/util/math/noise/NoiseGen.java
+++ b/src/mightypork/util/math/noise/NoiseGen.java
@@ -19,6 +19,19 @@ public class NoiseGen {
 	private final double density;
 	
 	
+	/**
+	 * make a new noise generator with a random seed
+	 * 
+	 * @param density noise density (0..1). Lower density means larger "spots".
+	 * @param low low bound ("valley")
+	 * @param middle middle bound ("surface")
+	 * @param high high bound ("hill")
+	 */
+	public NoiseGen(double density, double low, double middle, double high) {
+		this(density, low, middle, high, Double.doubleToLongBits(Math.random()));
+	}
+	
+	
 	/**
 	 * make a new noise generator
 	 *