Gigapocalypse (EP)

You need to “solve” 5 “Chess Puzzles” which is super simple, but grindy. They are found in the Knight Age world and they appear as a pawn on the ground. You can solve the “puzzle” by shooting 3 pawns to turn them white to black or vice versa once per run and that counts as one “solve”. If you see a golden box appear when you shoot the third one, you have solved it for that run and can quit back to the menu and start another run. This takes a little longer because you need to grind it a bit with 5 runs if you aren't going for 100% completion in this game.