Mega Man 2

Mega Man 2 GamePlay:

Mega Man 2 is an action-platformer video game developed and published by Capcom for the Nintendo Entertainment System (NES) in 1988. The player controls the main character, Mega Man, as he battles through a series of levels to defeat eight robot masters and their minions. Along the way, the player can collect special weapons and abilities from the defeated bosses to use against other enemies and bosses. The game is known for its challenging difficulty, memorable soundtrack, and colorful graphics.

MobyGames.com description:

Mega Man 2 is the sequel to the NES game Mega Man. In this game, Metal Man, Air Man, Bubble Man, Quick Man, Crash Man, Flash Man, Heat Man and Wood Man are Dr. Wily's eight prize creations that have been sent to take over the world. As Mega Man defeats these bosses, he can steal their powers and use them for himself. Each Robot Master is weak against another's weapon, and through experimentation, Mega Man can gain the upper hand by using the weapon they're vulnerable against.

Reference: https://en.wikipedia.org/wiki/Mega_Man_2

More detail at MobyGames: https://www.mobygames.com/game/5084/mega-man-2

Cheatcodes: https://gamefaqs.gamespot.com/nes/563442-mega-man-2/cheats