diff --git a/source/GM-TE/GMTEBrush.class.st b/source/GM-TE/GMTEBrush.class.st
index 0a554a76..7dd5889a 100644
--- a/source/GM-TE/GMTEBrush.class.st
+++ b/source/GM-TE/GMTEBrush.class.st
@@ -4,7 +4,9 @@ Class {
 	#instVars : [
 		'currentBrush',
 		'radius',
-		'startMatrixIndex'
+		'firstMatrixIndex',
+		'startMatrixIndex',
+		'layer'
 	],
 	#category : #'GM-TE-UI'
 }
@@ -27,14 +29,75 @@ GMTEBrush >> currentBrush: anObject [
 
 {
 	#category : #'as yet unclassified',
-	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 13:17'
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 14:55'
 }
-GMTEBrush >> executeWithMatrixIndex: anIndex [
+GMTEBrush >> executeWithMatrixIndex: anIndex andLayer: aLayer [
 
 	self startMatrixIndex: anIndex.
+	self layer: aLayer.
 	^ self currentBrush value.
 ]
 
+{
+	#category : #forms,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 16:26'
+}
+GMTEBrush >> fillBrush [
+
+    | collection startTile visited |
+    self startMatrixIndex ifNil: [^nil].
+	visited := Matrix rows: (self layer rowCount) columns: self layer columnCount.
+    	collection := OrderedCollection new.
+	startTile := layer at: self startMatrixIndex x at: self startMatrixIndex y.
+	collection add: startMatrixIndex.
+	visited at: self startMatrixIndex x at: self startMatrixIndex y put: true.
+	self fillDfsWithVisited: visited andIndex: self startMatrixIndex andOriginTile: startTile andCollection: collection.
+
+    ^ collection
+
+]
+
+{
+	#category : #forms,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 16:24'
+}
+GMTEBrush >> fillDfsWithVisited: aVisitedMatrix andIndex: anIndex andOriginTile: anOriginTile andCollection: aCollection [
+
+	| borderingOffsets |
+	self flag: 'REFACTOR!'.
+	borderingOffsets := {(-1)@0. 0@(-1). 1@0. 0@1}.
+	borderingOffsets do: [: offset|
+		| newIndex newTile |
+		newIndex := offset + anIndex.
+		((self layer inBounds: newIndex) and: [(aVisitedMatrix at: newIndex x at: newIndex y) isNil]) ifTrue:[
+			newTile := self layer at: newIndex x at: newIndex y.
+			anOriginTile
+				ifNil: [newTile ifNil: [aCollection add: newIndex.
+					aVisitedMatrix at: newIndex x at: newIndex y put: true.
+					self fillDfsWithVisited: aVisitedMatrix andIndex: newIndex andOriginTile: anOriginTile andCollection: aCollection]]
+				ifNotNil: [
+					(newTile isNil not and: [anOriginTile imageForm bits hash = newTile imageForm bits hash])
+						ifTrue: [aCollection add: newTile.
+							aVisitedMatrix at: newIndex x at: newIndex y put: true.
+							self fillDfsWithVisited: aVisitedMatrix andIndex: newIndex andOriginTile: anOriginTile andCollection: aCollection]]]]
+]
+
+{
+	#category : #accessing,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 14:51'
+}
+GMTEBrush >> layer [
+	^ layer
+]
+
+{
+	#category : #accessing,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 14:51'
+}
+GMTEBrush >> layer: anObject [
+	layer := anObject
+]
+
 {
 	#category : #accessing,
 	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 12:48'
@@ -79,6 +142,15 @@ GMTEBrush >> radiusBrush [
 
 ]
 
+{
+	#category : #select,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 15:47'
+}
+GMTEBrush >> selectFillBrush [
+
+	self currentBrush: [self fillBrush]
+]
+
 {
 	#category : #select,
 	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 13:16'
diff --git a/source/GM-TE/GMTEEditorTileMap.class.st b/source/GM-TE/GMTEEditorTileMap.class.st
index 855b2d02..befd4d51 100644
--- a/source/GM-TE/GMTEEditorTileMap.class.st
+++ b/source/GM-TE/GMTEEditorTileMap.class.st
@@ -113,7 +113,7 @@ GMTEEditorTileMap >> model: anObject [
 
 {
 	#category : #'event handling',
-	#'squeak_changestamp' : 'JS 7/6/2024 14:23'
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 14:54'
 }
 GMTEEditorTileMap >> mouseDown: anEvent [
 	"Implements placement of tiles"
@@ -122,7 +122,7 @@ GMTEEditorTileMap >> mouseDown: anEvent [
 	self model singleLayerSelected ifFalse: [^nil].
 	activeLayer := self model selectedLayers anyOne.
 	
-	selectedCoordinates := self model brush executeWithMatrixIndex: (self tileIndexFromPosition: anEvent position).
+	selectedCoordinates := self model brush executeWithMatrixIndex: (self tileIndexFromPosition: anEvent position) andLayer: (self tileMatrixStack layer: activeLayer).
 	self updateTiles: selectedCoordinates inLayer: activeLayer FromEvent: anEvent.
 	
 	^ true
@@ -130,7 +130,7 @@ GMTEEditorTileMap >> mouseDown: anEvent [
 
 {
 	#category : #'event handling',
-	#'squeak_changestamp' : 'JS 7/6/2024 14:31'
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 15:22'
 }
 GMTEEditorTileMap >> mouseMove: anEvent [
 	"Implements highlighting of tiles when hovering"
@@ -139,7 +139,7 @@ GMTEEditorTileMap >> mouseMove: anEvent [
 	self model singleLayerSelected ifFalse: [^ nil].
 	
 	activeLayer := self model selectedLayers anyOne.
-	selectedCoordinates := self model brush executeWithMatrixIndex: (self tileIndexFromPosition: anEvent position).
+	selectedCoordinates := self model brush executeWithMatrixIndex: (self tileIndexFromPosition: anEvent position) andLayer: (self tileMatrixStack layer: activeLayer).
 	
 	self tileSelectionSet clearAllHighlightings.
 	
diff --git a/source/GM-TE/GMTETileMatrixLayer.class.st b/source/GM-TE/GMTETileMatrixLayer.class.st
index 96ddfb73..aa335343 100644
--- a/source/GM-TE/GMTETileMatrixLayer.class.st
+++ b/source/GM-TE/GMTETileMatrixLayer.class.st
@@ -69,6 +69,16 @@ GMTETileMatrixLayer >> asRescaledToWidth: aWidth height: aHeight [
 	 
 ]
 
+{
+	#category : #accessing,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/6/2024 16:14'
+}
+GMTETileMatrixLayer >> at: row at: column [
+	
+	(self inBounds: row@column) ifFalse: [^ nil].
+	^ super at: row at: column
+]
+
 {
 	#category : #comparing,
 	#'squeak_changestamp' : 'Ivo Zilkenat 6/24/2024 11:39'