I’ve played Super Metroid so many times I’ve lost count

The one metroid game I always find myself replaying Fusion.

Zero Mission was my first. Played it more than any of the others

super, snes (or emulators now)

I have over 200 hours in Dread. And I'm freaking stuck at the final boss on run time for hard mode that I want. But it's been so long now I have no idea how to control Samus anymore.

Super is really my most played. Played it when it first came out, and replay it probably once every year or so. Randomizers and hacks are awesome too.

Technically, Super Metroid, due to having played a ton of different randomizers, as well as some hacks.

I've also started a second playthrough of Fusion, but never finished it.

I rarely replay games but Super Metroid has a couple of playthroughs

Same for me, I don't know if it was because it was the first Metroid game I played on the release of for how the game feels in general but wow, I was addicted for weeks.