Puzzletube by Ziz is a “puzzle game on a tube”.

GP2x Open2x-FW: http://dl.openhandhelds.org/cgi-bin/gp2x.cgi?0,0,0,0,25,2898
GP2x OFW: http://dl.openhandhelds.org/cgi-bin/gp2x.cgi?0,0,0,0,25,2899
Dingoo OpenDingux: http://dl.openhandhelds.org/cgi-bin/dingoo.cgi?0,0,0,0,25,563
Wiz: http://dl.openhandhelds.org/cgi-bin/wiz.cgi?0,0,0,0,25,573
Caanoo: http://dl.openhandhelds.org/cgi-bin/caanoo.cgi?0,0,0,0,25,829