Puyo Puyo Tetris 2

Good news about this achievement is you dont have to 3 star every main level in the mode; you can get 3 stars on a side level (example, 5 P1)! If you're struggling like I was, you can try and do non-main levels and get 3 stars there.

If you're struggling to beat a level, boss, or whatever; turn off the Auto Difficulty in the Options & Data under Options. This will make the AI slower than they were and easier for you so you're not stressing about the AI knocking you out.

There are more than enough levels to get 100%, I have every main level besides 6-7 3 starred and I only went out of my way once (I kept pressing for next stage); I'm at 100.6% total with multiple levels still not played.

If you're struggling to make chains or whatever you need help on, there are lessons in the main menu that has multiple tutorials for chains and stackings!