diff --git a/core/src/main/java/mc/core/Location.java b/core/src/main/java/mc/core/Location.java
index fa1e00b..78b25c8 100644
--- a/core/src/main/java/mc/core/Location.java
+++ b/core/src/main/java/mc/core/Location.java
@@ -20,6 +20,10 @@ public class Location {
         );
     }
 
+    public static Location startPointLocation () {
+        return new Location(0,10,0);
+    }
+
     public void set(Location location) {
         this.x = location.x;
         this.y = location.y;
diff --git a/core/src/main/java/mc/core/world/ChunkLoader.java b/core/src/main/java/mc/core/world/ChunkLoader.java
new file mode 100644
index 0000000..a8213e4
--- /dev/null
+++ b/core/src/main/java/mc/core/world/ChunkLoader.java
@@ -0,0 +1,27 @@
+package mc.core.world;
+
+import java.util.Optional;
+
+public interface ChunkLoader {
+
+    /**
+     * Loads chunk from cache. If chunk in cache doesn't exist, loads from file (or other storage)
+     *
+     * @param x chunk position
+     * @param y chunk position
+     * @param z chunk position
+     * @return optional of chunk (nullable)
+     */
+    Optional<Chunk> loadChunk (int x, int y, int z);
+
+    /**
+     *  Tries to load chunk like {@link #loadChunk(int, int, int)}
+     *  If chunk doesn't exist, generates it with selected world generator
+     *
+     * @param x chunk position
+     * @param y chunk position
+     * @param z chunk position
+     * @return chunk
+     */
+    Chunk loadOrGenerateChunk (int x, int y, int z);
+}
diff --git a/core/src/main/java/mc/core/world/World.java b/core/src/main/java/mc/core/world/World.java
index be5002b..6da22a8 100644
--- a/core/src/main/java/mc/core/world/World.java
+++ b/core/src/main/java/mc/core/world/World.java
@@ -6,10 +6,14 @@ package mc.core.world;
 
 import mc.core.Location;
 
+import java.util.UUID;
+
 public interface World {
+    UUID getWorldId();
+
     Location getSpawn();
     void setSpawn(Location location);
 
-    Chunk getChunk(int x, int z);
-    void setChunk(int x, int z, Chunk chunk);
+    Chunk getChunk(int x, int y, int z);
+    void setChunk(int x, int y, int z, Chunk chunk);
 }
diff --git a/core/src/main/java/mc/core/world/WorldGenerator.java b/core/src/main/java/mc/core/world/WorldGenerator.java
new file mode 100644
index 0000000..4b5fd30
--- /dev/null
+++ b/core/src/main/java/mc/core/world/WorldGenerator.java
@@ -0,0 +1,6 @@
+package mc.core.world;
+
+public interface WorldGenerator {
+
+    Chunk generateChunk (int x, int z, World world);
+}
diff --git a/flat_world/src/main/java/mc/world/flat/FlatWorld.java b/flat_world/src/main/java/mc/world/flat/FlatWorld.java
index 8340979..2e612a8 100644
--- a/flat_world/src/main/java/mc/world/flat/FlatWorld.java
+++ b/flat_world/src/main/java/mc/world/flat/FlatWorld.java
@@ -10,19 +10,25 @@ import mc.core.Location;
 import mc.core.world.Chunk;
 import mc.core.world.World;
 
+import java.util.UUID;
+
 public class FlatWorld implements World {
+
+    @Getter@Setter
+    private UUID worldId;
+
     @Getter
     @Setter
     private Location spawn = new Location(0, 6, 0);
     private Chunk chunk = new SimpleChunk();
 
     @Override
-    public Chunk getChunk(int x, int z) {
+    public Chunk getChunk(int x, int y, int z) {
         return chunk;
     }
 
     @Override
-    public void setChunk(int x, int z, Chunk chunk) {
+    public void setChunk(int x, int y, int z, Chunk chunk) {
         throw new UnsupportedOperationException();
     }
 }
diff --git a/generated_world/build.gradle b/generated_world/build.gradle
new file mode 100644
index 0000000..5c7cdc7
--- /dev/null
+++ b/generated_world/build.gradle
@@ -0,0 +1,7 @@
+group 'mc'
+version '1.0-SNAPSHOT'
+
+dependencies {
+    compile_excludeCopy project(':core')
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}
diff --git a/settings.gradle b/settings.gradle
index 52ad5e4..7855426 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -5,3 +5,5 @@ include('flat_world')
 include('vanilla_commands')
 include('proto_1.12.2') // Protocol 1.12.2
 include('proto_1.12.2_netty') // Protocol 1.12.2 (Netty impl.)
+include 'generated_world'
+