Shadow Moses Island originated in the first Metal Gear Solid game and its remake Twin Snakes. It appeared as a stage for Brawl and returned for Ultimate, as Smash 4 didn’t have Solid Snake on its roster.
It’s pretty true to its game. It’s a pretty basic stage but you get to see a lot of Metal Gear Solid tidbits like Metal Gear Rex, and even Metal Gear Ray which didn’t show up until the 2nd MGS game Sons of Liberty.
There are pillar and walls that confine you into the stage. They can be destroyed which makes it easier to knock people off the stage. But if you get knocked out here, it’s usually up.
I was glad to see it return for Ultimate, but it isn’t my favorite stage, but it’s far from my most disliked as well.