The player can now easily create a way through the maze. If something is in the way, just blow it up. That does make the game slightly easy. So let's add another challenge in the form of a points system and a way to get hurt when using the bomb.
We need another sprite for an explosion effect to follow the detonation of the bomb. The size of this sprite doesn't have to be exact, but it's a good idea to keep it roughly the same size as a tile, 60 pixels wide and 60 pixels high.
We can draw this sprite in Scratch easily as follows: