Use a rat as a projectile! It's not cruel, they enjoy it really. Slam the bottle with the hammer to project the rat into the air. Warning! The more oomph power you put into slamming the bottle, the less you have to keep the rat flying.
In this game you need to help Aang, Katara and Toph escape Fire Nation ship where they have been prisoned. You need to activate switches to open doors and to avoid Fire Nation guardians. Use the arrow keys to walk and jump and Z and X keys to switch between characters. Remember that each character has his/her special skills. Take advantage of these skills to complete your mission.