• It's Tetris.
• 32-bit (x86)
• Fully custom bootloader
• Soundblaster 16 driver
• Custom music track runner
• Fully hardcoded tetris theme
• Double-buffered 60 FPS graphics at 320x200 pixels with custom 8-bit RGB palette

NOTE: This has only been tested in an emulator. Real hardware might not like it.

$ make iso
$ qemu-system-i386 -drive format=raw,file=boot.iso -d cpu_reset -monitor stdio -device sb16 -audiodev coreaudio,id=coreaudio,out.frequency=48000,out.channels=2,out.format=s32

Use the same command as Mac OS, but try with pulseaudio as the audio device.

Absolutely no idea.

You probably know what you're doing if you're going to try this. Just burn boot.iso onto some bootable media and give it a go. If things break, try disabling all of the music since you probably don't have something with a SB16 in it.