diff --git a/source/GM-TE/GMTEEditor.class.st b/source/GM-TE/GMTEEditor.class.st
index c707dd0d..652142c4 100644
--- a/source/GM-TE/GMTEEditor.class.st
+++ b/source/GM-TE/GMTEEditor.class.st
@@ -17,7 +17,8 @@ Class {
 		'tileMap',
 		'associatedMorph',
 		'commands',
-		'currentCommand'
+		'currentCommand',
+		'brushMode'
 	],
 	#category : #'GM-TE-UI'
 }
@@ -270,6 +271,22 @@ GMTEEditor >> blendSelectedLayers [
 	self changed: #getLayerList
 ]
 
+{
+	#category : #accessing,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 15:39'
+}
+GMTEEditor >> brushMode [
+	^ brushMode
+]
+
+{
+	#category : #accessing,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 15:39'
+}
+GMTEEditor >> brushMode: anObject [
+	brushMode := anObject
+]
+
 {
 	#category : #building,
 	#'squeak_changestamp' : 'TW 6/25/2024 15:56'
diff --git a/source/GM-TE/GMTEEditorTileMap.class.st b/source/GM-TE/GMTEEditorTileMap.class.st
index 8d657e6a..029d84cd 100644
--- a/source/GM-TE/GMTEEditorTileMap.class.st
+++ b/source/GM-TE/GMTEEditorTileMap.class.st
@@ -22,6 +22,30 @@ GMTEEditorTileMap class >> tileWidth: aWidth tileHeight: aHeight padding: aPaddi
 		model: aModel
 ]
 
+{
+	#category : #TODO,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 17:07'
+}
+GMTEEditorTileMap >> calculateTileCollectionFromPosition: aPos andLayer: aLayer [
+
+	| index rawCollection resultCollection |
+	self flag: 'remove method'.
+	index := self tileIndexFromPosition: aPos.
+	index ifNil: [^ nil].
+	rawCollection := OrderedCollection new.
+	resultCollection := OrderedCollection new.
+	self flag: 'Add different algos'.
+	rawCollection add: (self tileMatrixStack layer: aLayer at: index y at: index x).
+	self halt.
+
+	rawCollection add: (self tileMatrixStack layer: aLayer at: index y at: ((index x)+1)).
+	rawCollection do: [:t |
+		t ifNil: [resultCollection add: (self generateTileAtlayer: aLayer x: index x y: index y stack: self tileMatrixStack tileType: GMTETile)].
+		t ifNotNil: [resultCollection add: t]
+	].
+	^ resultCollection
+]
+
 {
 	#category : #accessing,
 	#'squeak_changestamp' : 'Alex M 6/28/2024 19:28'
@@ -89,29 +113,29 @@ GMTEEditorTileMap >> model: anObject [
 
 {
 	#category : #'event handling',
-	#'squeak_changestamp' : 'Alex M 7/1/2024 15:40'
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 17:39'
 }
 GMTEEditorTileMap >> mouseDown: anEvent [
 	"Implements placement of tiles"
 
-	| clickedTile activeLayer |
+	| selectedCoordinates activeLayer |
 	self model singleLayerSelected 
 		ifTrue: [
 			activeLayer := self model selectedLayers anyOne.
 			
-			clickedTile := self tileFromPosition: anEvent position layer: activeLayer.
-			self updateTile: clickedTile inLayer: activeLayer FromEvent: anEvent].
+			selectedCoordinates := self radiusBrushFromCenter: (self tileIndexFromPosition: anEvent position) withRadius: 1.
+			self updateTiles: selectedCoordinates inLayer: activeLayer FromEvent: anEvent].
 	
 	^ true
 ]
 
 {
 	#category : #'event handling',
-	#'squeak_changestamp' : 'Alex M 7/1/2024 15:40'
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 16:21'
 }
 GMTEEditorTileMap >> mouseMove: anEvent [
 	"Implements highlighting of tiles when hovering"
-
+"
 	| hoveredTile hoveredTileHighlighting activeLayer |
 	self model singleLayerSelected
 		ifTrue: [activeLayer := self model selectedLayers anyOne.
@@ -123,9 +147,9 @@ GMTEEditorTileMap >> mouseMove: anEvent [
 	
 		hoveredTileHighlighting ifNotNil: [self tileSelectionSet highlightTile: hoveredTileHighlighting].
 	
-		"TODO why another ifNil check here?"
+		TODO why another ifNil check here?
 		
-		self updateTile: hoveredTile inLayer: activeLayer FromEvent: anEvent]
+		self updateTile: hoveredTile inLayer: activeLayer FromEvent: anEvent]"
 ]
 
 {
@@ -153,6 +177,20 @@ GMTEEditorTileMap >> previousTileStates: anObject [
 	previousTileStates := anObject
 ]
 
+{
+	#category : #initialization,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 17:19'
+}
+GMTEEditorTileMap >> radiusBrushFromCenter: aPos withRadius: aRadius [
+	
+	|collection|
+	self flag: 'temporary only'.
+	collection := OrderedCollection new.
+	collection add: aPos.
+	collection add: (aPos + (0@1)).
+	^ collection
+]
+
 {
 	#category : #updating,
 	#'squeak_changestamp' : 'Ivo Zilkenat 6/24/2024 11:35'
@@ -252,54 +290,34 @@ GMTEEditorTileMap >> tileSelectionSet: anObject [
 
 {
 	#category : #updating,
-	#'squeak_changestamp' : 'Alex M 7/1/2024 16:08'
+	#'squeak_changestamp' : 'Alex M 6/25/2024 18:08'
+}
+GMTEEditorTileMap >> updateTileSprite: aTile [
+	"Helper function to apply sprite from tile selection to aTile"
+
+	self model selectedTile ifNotNil: [aTile updateSprite: self model selectedTile]
+]
+
+{
+	#category : #updating,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 17:59'
 }
-GMTEEditorTileMap >> updateTile: aTile inLayer: aLayer FromEvent: anEvent [
+GMTEEditorTileMap >> updateTiles: aCoordinateCollection inLayer: aLayer FromEvent: anEvent [
 	"Add currently selected tile (model) to editable matrix stack at mouse position"
-	
-	| tileIndex hoveredTile |
-	hoveredTile := aTile.
+	| tile |
 	
 	(self tileIndexFromPosition: anEvent position) ifNil: [^ nil].
 	
 	(anEvent redButtonPressed and: [self model selectedTile notNil]) 
 		ifTrue: [
-			
-			self savePreviousImageFromPosition: anEvent position inLayer: aLayer.
-			
-			"Add tile if nil at mouse position"
-			hoveredTile ifNil: [
-				tileIndex := self tileIndexFromPosition: anEvent position.
-				tileIndex ifNil: [^ nil].
-				hoveredTile := self generateTileAtlayer: aLayer x: tileIndex x y: tileIndex y stack: self tileMatrixStack tileType: GMTETile].
-			
-			"Set tile to currently selected tile"
-			self updateTileSprite: hoveredTile.
-			
-			self saveNewImageFromPosition: anEvent position inLayer: aLayer.
+			aCoordinateCollection do: [:c |
+				self savePreviousImageFromPosition: (self correctedTilePositionMap: c) inLayer: aLayer.
+				((self tileMatrixStack layer: aLayer) inBounds: c) ifTrue: [
+					tile := self tileMatrixStack layer: aLayer at: c y at: c x.
+					tile
+						ifNil: [ tile := self generateTileAtlayer: aLayer x: c x y: c y stack: tileMatrixStack tileType: GMTETile].
+					self updateTileSprite: tile.
+					self saveNewImageFromPosition: tile position inLayer: aLayer]
+				].
 			self model savedSinceModified: false].
-	
-	((anEvent yellowButtonPressed) and: [hoveredTile notNil]) 
-		ifTrue: [
-			self savePreviousImageFromPosition: anEvent position inLayer: aLayer.
-			
-			"Remove tile if any present at mouse position"
-			aLayer ifNotNil: [
-				tileIndex := self tileIndexFromPosition: anEvent position.
-				self tileMatrixStack layer: aLayer at: tileIndex y at: tileIndex x put: nil.
-				hoveredTile abandon].
-			
-			self saveNewImageFromPosition: anEvent position inLayer: aLayer.
-			self model savedSinceModified: false].
-		
-]
-
-{
-	#category : #updating,
-	#'squeak_changestamp' : 'Alex M 6/25/2024 18:08'
-}
-GMTEEditorTileMap >> updateTileSprite: aTile [
-	"Helper function to apply sprite from tile selection to aTile"
-
-	self model selectedTile ifNotNil: [aTile updateSprite: self model selectedTile]
 ]
diff --git a/source/GM-TE/GMTETileMatrixLayer.class.st b/source/GM-TE/GMTETileMatrixLayer.class.st
index 3c6a52af..96ddfb73 100644
--- a/source/GM-TE/GMTETileMatrixLayer.class.st
+++ b/source/GM-TE/GMTETileMatrixLayer.class.st
@@ -32,14 +32,17 @@ GMTETileMatrixLayer >> aboveLayer: aLayer [
 
 {
 	#category : #adding,
-	#'squeak_changestamp' : 'Ivo Zilkenat 6/23/2024 21:27'
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 17:50'
 }
 GMTETileMatrixLayer >> addTile: aTile at: y at: x [
 
-	aTile ifNotNil: [
+	(aTile isNil not and: [self inBounds: x@y]) ifTrue: [
 		aTile morphicLayerNumber: self layerIndex.
 		aTile visible: self visible].
 	^ self at: y at: x put: aTile
+	
+
+
 ]
 
 {
@@ -119,6 +122,17 @@ GMTETileMatrixLayer >> free [
 	self setNil
 ]
 
+{
+	#category : #comparing,
+	#'squeak_changestamp' : 'Valentin Teutschbein 7/5/2024 17:52'
+}
+GMTETileMatrixLayer >> inBounds: aPos [
+
+	(aPos x > self columnCount or: [aPos x < 1]) ifTrue: [^ false].
+	(aPos y > self rowCount or: [aPos y < 1]) ifTrue: [^ false].
+	^ true
+]
+
 {
 	#category : #initialization,
 	#'squeak_changestamp' : 'Ivo Zilkenat 6/23/2024 21:09'