Mega Man II uses the same structure as its Gameboy predecessor, using four bosses each from Mega Man 2 and 3 on the NES. A few significant changes to the formula result in a much smoother experience, though not one without some significant flaws.
Once again, you find yourself choosing from among four bosses to start with, in relatively classic Mega Man style. None of these stages is particularly difficult, in contrast to the previous game. However, the balance is somehow very off. Many enemies take way more firepower than you would expect to defeat: for example, bats take multiple shots. The stages also have several areas where the enemy placement results in a pretty unfair situation no matter what you do. However, you have energy tanks this time around, and with the exception of some obstacles, nothing seems to do all that much damage to Mega Man. The result is stages that don’t feel unfair, but don’t entirely feel like Mega Man, either.
The bosses are well translated to the smaller screen, using similar patterns to their NES predecessors but scaled appropriately. There are several valid starting points in the rotation, and no stage acts as a major barrier without a given weapon. The weapons are strangely limited, often using a lot of power per shot, but you don’t really need them in most cases. If anything, it’s a bit too easy.
After a short cutscene following the initial bosses, you’ll be introduced to the next four. Here is where the game kind of loses its way. Compared to Dr. Wily’s Revenge, these bosses at least have their own stages now. However, the game considers all four one single stage, so your weapons don’t get refilled between them. Worst of all, the game again gives no indication of which boss is which. As a result, these second four stages are necessarily pretty easy.
The new elements added to the game are generally well done, though the special boss and his unique weapon are decidedly odd this time around. The game is longer than its predecessor, but much easier, to the point where you’re likely to complete it much faster. Still, it has a respectable number of stages for a Gameboy game of the time.
How you feel about Mega Man II will rest heavily on why you like Mega Man games. If you’re in it for the tight play control and high challenge, this will not be the game for you. It’s a bit sloppy and easy to power your way though. But if you just enjoy the general Mega Man gameplay and collecting weapons, this isn’t a bad game at all.