Game Boy on my MP3 player?

‘Have you ever wondered, what would life be like if you could play Doom, Pokemon and a handful of naff games on my MP3 player?… [With Rockbox] you will be able to play several classic, addictive games like Snake, Breakout and Pong… [as well as] a Game Boy emulator and Doom.

‘This is all courtesy of Rockbox, an open source project providing an alternative to your native MP3 player’s firmware, a standardised platform which offers perhaps enhanced playback options with more codecs or just a better environment to navigate compared to your original MP3 player. It is available on a large and continually growing range of big brand devices including Apple, Archos and Sandisk (for the full compatibility list, look here). Oh yeah, and it also plays games.’