Unlock Schwarzen Tank:
To unlock Slival's tank, the Schwarzen, you must first beat the final boss. Then, go to Mt. Krakatroda to the spot where you fought Slival earlier. Beat him again and the Schwarzen is yours. He'll have about 3,000 HP, so come prepared for a fight.
Female Slime tank in challenge mode:
Press Y, R, R, U, L, L, Y, Down, Down, Down, Y, Select inside the church.
Helmet Slime tank in challenge mode:
Press Y, L, L, Y, R, R, Y, Up, Down, Select inside the church.
Unlock Knightro Tank for multiplayer:
Press Y, L, L, Y, R, R, Y, Up, Down, Select inside the church.
Unlock The Nemesis for multiplayer:
Press Y, R, R, up, L, L, Y, Down, Down, Down, Y, Select inside the church.
Thanks to Revolution Readers Ferg, Hastlo and Carmen!
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