I'v written a small number-moving game simular to those little toys or the common mobilephone-game. It's made to run in graphical mode (could surely be converted to a non-graphical UI too). It's located at
http://www.efd.lth.se/~f03kr/nummove.tar.gz
If you like it, then great :) If not, well then I still continue playing it myself ;)