The game below is designed to only use lines of the form x=... and y=... This could easily be changed by creating cards and a graph for lines of the form y=mx+b where neither m nor b are 0. As we mention on the previous page we think this would be a great online game if anyone would be interested in programming it. It also might be possible to try to adapt the game to play on GeoGebra which might be more challenging or at least differently challenging. If anyone does this let us know! :)