Play Rockman 4 - Aratanaru Yabou!! (Japan) [Hack by Rock5easily v20090810] (~Rockman 4 Endless) Online

Rockman 4 - Aratanaru Yabou!! (Endless Hack) is basically the original game cranked up to 11. You know those Robot Master stages you’ve memorized? Yeah, forget that—this version throws remixed layouts, brutal enemy waves, and some nasty surprises at you. The first time I jumped into Cut Man’s stage (or whatever they renamed him here), I got swarmed by enemies I’d never seen before. It’s chaotic, but in that good Mega Man way where you’re grinning while getting wrecked.

What I like is that it doesn’t just ramp up the difficulty randomly—the tweaks feel deliberate, like someone actually played through the original and thought, “This part could be meaner.” Some weapons behave differently, too, so even if you’ve got muscle memory from the vanilla game, you’ll need to adjust. Not for the faint of heart, but if you’ve ever wanted Mega Man 4 to punch back harder, this hack delivers.