This is an multitouch version of the old arcade classic TRON - deceptively simple yet addicting. Each player commands a line of light. It's speed is fixed, but turns left and right are possible by pressing one of two buttons. If you run into another line, you lose.
TROff is Open Source and licensed under the GPL. You can get the source code using
svn co https://www.libavg.de/svn/trunk/avg_media/mtc/troff
There is an Ubuntu package for TROff.
Written by Thomas Schott.