Virtual Virtual Boy (VVB) is an emulator for the Virtual Boy 3D console. You can use it with a pair of cheap Anaglyph 3D glasses, or with Google Cardboard, to play Virtual Boy games on an Android phone. Planet Virtual Boy has many free homebrew games available at https://www.virtual-boy.com/homebrew/. The game in the screenshot is Red Square, made by Kresna and Nyrator. Source available online at https://github.com/SupernaviX/vvb Disclaimer: This application is not affiliated with Nintendo or Virtual Boy in any way.