Nano Ninja is interesting, because it is a one-button game. Help the Nano Ninja reach the top of a building to save his abducted master. But, every floor contains a new danger. You can choose to either use Spacebar, the X key, or the left mouse button to control Nano Ninja. On each floor, your key will do something different, depending on the danger. This includes throwing a weapon, running, jumping, and stopping. Get your ninja safely to the door on the other side of the room to climb up to the next floor.