diff --git a/World.md b/World.md
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index 0000000..5e5b9ce
--- /dev/null
+++ b/World.md
@@ -0,0 +1,22 @@
+Each world is a grid of 16x16 tiles. The middle part of the grid is generated randomly while the outer part is guaranteed to follow these rules:
+```
+1 1 1 1 1 1 2 2 2 2 1 1 1 1 1 1
+1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
+1 0 * * * * * * * * * * * * 0 1
+1 0 * * * * * * * * * * * * 0 1
+1 0 * * * * * * * * * * * * 0 1
+1 0 * * * * * * * * * * * * 0 1
+2 0 * * * * * * * * * * * * 0 2
+2 0 * * * * * * * * * * * * 0 2
+2 0 * * * * * * * * * * * * 0 2
+2 0 * * * * * * * * * * * * 0 2
+1 0 * * * * * * * * * * * * 0 1
+1 0 * * * * * * * * * * * * 0 1
+1 0 * * * * * * * * * * * * 0 1
+1 0 * * * * * * * * * * * * 0 1
+1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
+1 1 1 1 1 1 2 2 2 2 1 1 1 1 1 1
+``` 
+0: These tiles are always plain tiles
+1: These tiles are always wall tiles
+2: These tiles are always plain tiles and Biomass will never spawn here
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