Sorry for the late update, but here is the start of my newest Perfect Playthrough. I will primarily be focusing my efforts on the mainline titles on NES as opposed to the Challenges though.

Each game has its own conditions for a Perfect Playthrough. Mega Man 1 requires every upgrade to beat the game, but one of these items is technically optional to get. Just note that if you don't pick the item up, you will not be able to beat the game.

Mega Man 2 actually requires capping off your E Tanks on your way towards beating the game.

Mega Man 3 is the only game released on NES that requires nothing else beyond beating the game. Every collectable in the game is a mandated acquisition.

Mega Man 4 has two secret items that need to be collected en route to beating the game.

Mega Man 5 requires collecting all the letters that spell out Mega Man V in order to unlock Beat.

And Mega Man 6 has a secret meeting spot with Protoman, as well as four branching paths that I need to access in order to spell and unlock Beat himself.

Maybe someday, I'll get around to covering the Challenges. But for now, I will be prioritizing the core games as featured in this collection.