Mario Bros. on NES is one of those classics that feels simple at first—until you realize how much chaos two plumbers can cause. You start off just knocking turtles and crabs out from under pipes, but then the pace picks up, and suddenly you're frantically bouncing enemies off platforms before they respawn. The controls are tight (Z and X for jumping and punching, arrows to move), though good luck not hitting the wrong button when things get hectic.

It’s way more fun with a friend—nothing like accidentally shoulder-bumping your co-op partner into a rogue Koopa. The graphics are obviously old-school, but there’s something satisfying about the way the screen shakes when you clear a wave. Just don’t expect any power-ups or fancy Mushroom Kingdom stuff—this is pure arcade-style survival.