So I was watching AGDQ and I saw one thing they had was a "Super Metroid/A Link to the Past Combo Randomizer"

Here's the first run they did of it (they did another run this year, this time as a race).

It starts off as Super Metroid... then you walk thru a door and are playing ALttP... its like, two of the greatest SNES games (well, one greatest and one kinda-good) mushed into one!

And yes, apparently its playable on a real SNES using like an SD2SNES or something.