The brain behind a number of Super Mario 64 mods has done it again by recreating lots of Super Mario Bros. Super Mario levels inside or Super Mario 64.
Murder Kaze Emanuar has taken the 2D level design of that older game and crammed it into the engine or Super Mario 64 . Judging from the video announced at this time, you can do all the leaping, hopping, and air flipping at a modern Mario can while still enjoying the "classic" feel of the levels.
The mod also contains four playable characters: Mario, Luigi, Wario, and Waluigi. They all play a little differently, so if you want to mix up your experience of these classic recreations, you've got the ability to do so.
You can grab the download for the mod in the description of the video. It's also worth noting that the creator, in a comment below the video, says that playing the game as Wario makes it feel "unfair."
And, you know, it's nice that the modding community remembers Waluigi. It's something I can say of more, ahem, official source.