Make heater or cooler touch electric metal(metal with electro on it). Thhen they will do what their names imply, heat and cool things. The heater can melt ice and the cooler can freeze water, among other things.
This is so much better than powder game. The physics are better, the size of the curser is more precise, and you can fill up the entire screen. Sure there are no people, but the people in powder game are useless!