Board Thread:Questions and Answers/@comment-112.200.69.99-20141212112349/@comment-25852805-20141212194507

Short version: You unlock true forms when a basic cat is level 29

Explanation:

You unlock evolved form at lvl 10. After you beat chapter 2, you can upgrade your cats to level 20 (with XP), when it becomes "Max". However, you can continue to upgrade you basic cat by merging it with the same cat from common gacha (the one you need tickets for, not the premium one). The cat's level becomes "Max + x", where x is the additional times you've merged additional cats (Note: once a cat is "Max" lvl, you can't upgrade it with XP). Once a cat is "Max +9", it will unlock it's true form (Note: only basic cats have true forms).