🎮 Play Mega Man 4 (USA) (Rev A) [Hack by Insectduel v1.0] (~Megaman Showdown IV) (Boss Mode) Online (NES)

Megaman Showdown IV is a ROM hack of Mega Man 4 for the NES, created by Insectduel. This version modifies the original release into a dedicated “Boss Mode,” allowing players to jump straight into the action against the game’s Robot Masters without traversing the standard platforming stages. It offers a streamlined challenge for fans who want to test their combat skills against the bosses directly in your browser.

How to Play

In this boss rush hack, your objective is to defeat each of the bosses from the original game. Since this is an NES title, the default browser controls map the D-pad to your arrow keys, Z for jumping (A button), X for shooting your Mega Buster (B button), and Enter for Start.

Tips

• Charge Your Shot: Just like in the base Mega Man 4 game, you can hold down the shoot button to charge the New Mega Buster for a more powerful attack.
• Learn the Patterns: Since you are fighting bosses directly, memorising their movement and attack patterns is critical to preserving your health.