Replace your hashtray crafts with these safe and non addictive strategy games items. See http://en.wikipedia.org/wiki/Tic-tac-toe for more details. Using this physical, metal analog of the popular pen and pencil game is far more ecco friendly than the original dead tree version, provided you play it often enough.This wonderful game is made from 2 CNC milled parts: the board and the pieces. The board is done in one easy setup and two operations:And let's just say the facing the sides, the bottom surface (and custom engraving it) are optional operations. The X and O\'s are cut out of a sheet of material.It is very possible that you don\'t have a 9.525mm end mill, a 95.4mm x 68.8 mm x 15 mm aluminium stock or a 7 mm bronze sheet... in which case the ngc files are completely useless for you. But you can change the feed rates and tool depth per pass by using the online tic-tac-toe generator for the supplies and tools you have at hand (wood, plexiglass) at this link:http://machinetouch.appspot.com/tictactoe.pyPlease try some air cutting first or wait for the video instruction since the motions in the generated files have not been tested with you in mind.Copying is not stealing, but cheating at tic-tac-toe is meh.