Castle Tuberia is the final level in Keen Dreams, not counting the boss battle with King Boobus Tuber. It must be completed before Keen can reach Boobus' Chamber. Just like any castle would be, this castle is heavily guarded. The creatures on full alert are the Tater Trooper, the Asparagusto, the Frenchy, the Sour Grape, the Squasher, and the Tomatooth. This level involves a lot of jumping, climbing and backtracking. Two Keys are required to gain access to the exit, which is also heavily guarded. Before leaving, there are plenty of goodies on top of the castle. Castle Tuberia has the highest points available in the game. With three extra lives also available in this level, that should give you enough lives to fight King Boobus Tuber.