Quake on your phone
1) Install the PIPs engine from http://koti.mbnet.fi/hinkka/Download.html
2) Install the Quake software, also from http://koti.mbnet.fi/hinkka/Download.html
3) Get the Shareware version of Quake from http://www.libsdl.org/projects/quake/data/quakesw-1.0.6.zip
4) Follow the instructions at http://koti.mbnet.fi/hinkka/installation.html
Hey presto, fragging on your phone.