diff --git a/.gitattributes b/.gitattributes
index c84c197d5..69f4dd9e3 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -5,3 +5,4 @@
 *.opus filter=lfs diff=lfs merge=lfs -text
 *.pdf filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
+*.kra filter=lfs diff=lfs merge=lfs -text
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index e6e7ba5d5..d5a73b6a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,7 @@ workspace.xml
 # Temporary files
 .tmp*
 tmp_*
+*.bak
 ## Microsoft Office
 ~$*
 ## Generic temp files in Linux
diff --git a/src/net/torvald/terrarum/ModOptionsHost.kt b/src/net/torvald/terrarum/ModOptionsHost.kt
new file mode 100644
index 000000000..98a067f75
--- /dev/null
+++ b/src/net/torvald/terrarum/ModOptionsHost.kt
@@ -0,0 +1,38 @@
+package net.torvald.terrarum
+
+import com.badlogic.gdx.graphics.Camera
+import com.badlogic.gdx.graphics.g2d.SpriteBatch
+import net.torvald.terrarum.modulebasegame.ui.UIRemoCon
+import net.torvald.terrarum.ui.UICanvas
+
+class ModOptionsHost : UICanvas() {
+
+    override var openCloseTime: Second = 0f
+
+    private val moduleAreaHMargin = 48
+    private val moduleAreaBorder = 8
+
+    override var width = AppLoader.screenW - UIRemoCon.remoConWidth - moduleAreaHMargin
+    override var height = AppLoader.screenH - moduleAreaHMargin * 2
+
+    override fun updateUI(delta: Float) {
+    }
+
+    override fun renderUI(batch: SpriteBatch, camera: Camera) {
+    }
+
+    override fun doOpening(delta: Float) {
+    }
+
+    override fun doClosing(delta: Float) {
+    }
+
+    override fun endOpening(delta: Float) {
+    }
+
+    override fun endClosing(delta: Float) {
+    }
+
+    override fun dispose() {
+    }
+}
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UITitleRemoConYaml.kt b/src/net/torvald/terrarum/modulebasegame/ui/UITitleRemoConYaml.kt
index 5f07c632f..592b12f58 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UITitleRemoConYaml.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UITitleRemoConYaml.kt
@@ -27,6 +27,7 @@ object UITitleRemoConYaml {
           - MENU_LABEL_RETURN
          - MENU_OPTIONS_SOUND
          - MENU_LABEL_LANGUAGE : net.torvald.terrarum.modulebasegame.ui.UITitleLanguage
+         - MENU_MODULES : net.torvald.terrarum.ModOptionsHost
          - MENU_LABEL_RETURN
         - MENU_MODULES : net.torvald.terrarum.modulebasegame.ui.UITitleModules
          - MENU_LABEL_RETURN
diff --git a/work_files/DataFormats/Map data format.txt b/work_files/DataFormats/Worldmap format.txt
similarity index 94%
rename from work_files/DataFormats/Map data format.txt
rename to work_files/DataFormats/Worldmap format.txt
index 3d370d573..0e3265f2a 100644
--- a/work_files/DataFormats/Map data format.txt	
+++ b/work_files/DataFormats/Worldmap format.txt	
@@ -88,3 +88,5 @@ EOF  FE   Byte order mark
 
 
 * To read layers: you'll need to search for specific strings, namely ["TERR", "WALL", "WIRE"]
+* It is possible that compressed data happen to replicate any of the internal identifiers
+  (e.g. "\0pLdTERR", "EndTEM\xFF\xFE", "EndPYLd\xFF"), but such probability is very low (0.000000000000000005421 %)
diff --git a/work_files/physics_staircasing.kra b/work_files/physics_staircasing.kra
index 3a2046800..de833b3be 100644
Binary files a/work_files/physics_staircasing.kra and b/work_files/physics_staircasing.kra differ