Supertux works great on 6k (although the usual 6K problem up/down & left/right are all reversed) when I installed it into internal memory (i had about 21mb free befroe installation). However, the installation to my ext2 sd causes the add/remove application hang. I watched in the system info how the installation goes. interestingly, even though I instructed it to be installed into ext2 sd, the program still installes itself into the internal memory. I guess that's why it confuses the ipkg gui at the end of the installation, when ipkg tried to link and create the desktop icon.