Mega Man Anniversary Collection: Button Swap
MHzBurglar's patch fixes the GameCube collection's awkward default layout, so B fires and A jumps as it should, with no menu setting needed.
What's changed
The GameCube release of the collection shipped with the jump and shoot buttons the other way round from what most players expect, and the game gives no option to remap them. This small hack swaps the two: B now shoots and A now jumps, across the games in the collection.
Nothing else is touched, so the games, menus and extras play exactly as before. Version 1.0 came out in April 2021, credited to MHzBurglar.
Playing it
The patch is applied to your own copy of the game, following the instructions on the hack's page.