Heres what you do to make it simple.
1. Beat all the monsters.
2 When you reach stage 1-4 select a unit. Preferably a lower level, but it doesn't matter anyways.
3. Defeat the boss.
4 Select your new stage.
5. Now you should see that same characters bio up. Click on sell even though it says you can't.
6. Thank me. Your now done. Beat the game.
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this works, but the game is easy enough without cheat :>
