To unlock Slival's tank, the Schwarzen, for Tank Masters mode, you must first beat the final boss. Then, go to the place where you fought Slival on Mt. Krakatroda. Defeat him again (He will have 3000 HP) and you will unlock the Schwarzen
To break through the crystal walls that are located in levels Callmigh Bluff and Mt. Krakatroda, you must first rescue Mama Mia and Big Daddy from Callmigh Bluff. Then go talk to the Goonins (Rescue them from the tank battles in Backwoods) who live in the Goonin hole (next to the King's Palace). Then you will have to pass the Goonin trials.
GamesRadar is the premiere source for everything that matters in the world of video games. Casual or core, console or handheld - whatever systems you own or whatever genres you love, GamesRadar is there to filter out what's worth your time and to help you get even more from your games. We deliver the best advice, the most in-depth features, expert reviews, and the essential guides for all the top games.