In some later rounds you have to kill “out of the way” enemies to get keys from them to unlock doors.Try to go on the path which encounters the fewest or weakest enemies, while offering you the most power ups along the way. On some levels there are multiple parallel paths through the game.If you get the ring with a crown on it you have a +1 defense, which means if the enemy has an attack power of 1 then the first time they try to attack you they can’t.If your attack is at that level they can not hit you. When you go near an enemy it shows how much HP they have.