Dungeon Hunter 3 for the mobile.

I paid like $7 for DH2. It was great. It was totally a Diablo rip off, but it was a full game for $7.

DH3 came out when the free to play model started getting a lot of traction.

Every single thing you did cost a dollar. Leveled up? Apply your points for $.99! Looted a treasure chest? Equip the items for $.99! Those are honestly the only two examples I got. I uninstalled it after playing for about 5 minutes.