Really cool development in the Virtual Boy emulation scene as of a couple days ago!
For years and years I've wanted a Virtual Boy emulator on the 3DS since it's the perfect system to emulate the stereoscopic 3D effect, but one never came out. There was one called r3Ddragon that was partially developed years ago but it never really worked.
Apparently over the past few months or so, a new developer forked that project and completed it! It's called Red Viper and plays all official Virtual Boy games at full speed on any 3DS with full stereoscopic 3D support! There have been some crashes reported by users now that it's available for testing, but I tried it out yesterday to play the Virtual Boy Wario Land game and it worked great!
The graphics are super crisp on my New 3DS XL screen and the stereoscopic 3D effect is perfect! You can even change the default red color to any color you want and it has button mapping support to use the ABXY buttons as the second DPad when needed for some games (otherwise it's on the touch screen or vice versa).
It should work on a 2DS but the games are very difficult to play without the stereoscopic effect and it kind of defeats the point, so I highly recommend using a 3DS. I happen to have a New 3DS but apparently it also plays full speed on a regular 3DS, so really any model is fine except the 2DS. Also the 3DS depth slider "works" but only as a toggle, due to how the games are programmed the depth is always at maximum or completely off (EDIT: As of version 0.9.1 the depth slider is now fully functional!). But honestly it looks great!
I had completely given up hope that this would ever come out, but here we are!
Unironically one of my favorite movies