not correct, but doing something.

grid.gd

@@ -6,6 +6,7 @@ extends Node2D
 @export var offset: float = 55.0
 
 var grid: Array[Array]
+var groups: Array
 
 var token = preload("res://token.tscn")
 
@@ -23,10 +24,30 @@ func _ready():
 func populate_grid():
 	pass
 	
+func to_grid_coord(idx):
+	pass
+	
+func to_index(idx):
+	pass
+	
 func calculate_token_groups():
+	groups = []
+	var visited_nodes = []
+	var group_queue = []
 	for row in rows:
 		for col in cols:
-			var current_token = grid[row][col]
+			if [row, col] in visited_nodes:
+				continue
+				
+			group_queue.append([row,col])
+			
+			var new_group = []
+			while not group_queue.is_empty():
+				var current_coord = group_queue.pop_back()
+				var current_token = grid[current_coord[0]][current_coord[1]]
+				new_group.append(current_coord)
+				visited_nodes.append(current_coord)
+			
 				var adjacent_token_coords = [
 					[row - 1, col],
 					[row, col + 1],
@@ -39,5 +60,8 @@ func calculate_token_groups():
 				)
 			
 				for coord in valid_coords:
-				if grid[coord[0]][coord[1]].type == current_token.type:
+					if coord not in visited_nodes and grid[coord[0]][coord[1]].type == current_token.type:
-					print(coord)
+						group_queue.append(coord)
+			groups.append(new_group)
+			
+	print(groups)