35. Honestly, it’s Angry Birds 2 right now. There’s enough to keep me busy for a long time, without requiring me to buy crap.
36. Flippy Knife, as dumb as it sounds, it’s actually really entertaining.
37. CRIMO. It’s a free game where you solve picture puzzles to get clues to solve murders.
It does have in app purchases to buy extra lives, but you can wait and revive. I’ve never felt the need to spend anything on it. If you don’t make a mistake, you can keep playing for ages.