The brain behind a number of Super Mario 64 mods has done it again by recreating lots of Super Mario Bros. levels inside of Super Mario 64.
Modder Kaze Emanuar has taken the 2D level design of that older game and crammed it into the engine of Super Mario 64. Judging from the video that announced the mod, this allows the player to do all the leaping, hopping, and air flipping that a modern Mario can do while still enjoying the “classic†feel of the levels.
https://youtu.be/x5gkw1uQNw8
Full article: Kotaku (https://kotaku.com/modder-transforms-super-mario-64-into-super-mario-bros-1831275863)