And Pac-Man.[1] And Tetris.[2] And Mario.[3] And if you're particularly masochistic, The Hitchhiker's Guide to the Galaxy.[4,5]

And loads of other games and programs.[6]

1 https://www.rockbox.org/wiki/PluginPacbox

2 https://www.rockbox.org/wiki/PluginRockblox

3 https://www.rockbox.org/wiki/PluginRockboy

4 https://www.rockbox.org/wiki/PluginFrotz

5 https://if.illuminion.de/infocom.html

6 https://www.rockbox.org/wiki/PluginIndex