|LEGO® → System → Castle → Ninja|
This set is a medium-to-large Ninja set. It has 4 minifigures: Dojo, the Green Ninja Robber and 2 Ninja. In the instructions it shows one Samurai in the jail cell and the other pulling around a small catapult. The top of the catapult lifts up to reveal a Ninja Sword. The catapult device works by pushing down one part with enough force to cause the brick in it to go flying.
The Fortress is defended by a group of two Black Ninja. One of the Ninja pilots a flying vehicle. The jail cell of the fort can be removed, revealing a trap. If you pull out a piece, the trap flies down stabbing anyone in its way with four ninja swords. In the corner of the fort is a small compartment. On top is a black Ninja Sword, and under it is a stash of gold coins. Another feature of the fort is that among it's rocky walls, there are two "balconies".