Mega Man 3/Wily Fortress 2

This spike-laden level requires the Rush Jet to complete.

Again, it's pretty straightforward. Just go through the spike-lined corridor after the first shaft, using the Rush Jet to get through. Grab all the item energy capsules you can to keep it up and running. Otherwise you'll be sleeping on a bed of spikes tonight.

At the end, you'll meet an old enemy - the Yellow Devil, whom you may remember from [Mega Man 1]. The routine is the same here. Dodge the chunks of his body, and fire at his eye when he fully forms. His weakness is the Hard Knuckle. To avoid his chunk transferences, use the Rush Jet.