Mega Man IV on the Game Boy is a surprisingly ambitious adaptation of its NES counterpart. While the smaller screen and hardware limitations lead to some simplifications in level design, it introduces new mechanics like the Mega Buster charge shot and the shop system. These additions offer fresh strategies and alleviate some of the difficulty spikes of its predecessor. Despite some occasional slowdown, Mega Man IV delivers a solid, portable Mega Man experience that stands out among the Game Boy entries.