Gordon Shumway: Cylinder Line4 is on another site, and it is pretty fun - would be a nice addition here also.

Sphere Spider Line 4 would be strange - since you can place a piece on a wall - but in reality the wall is not there... so would it play just like Cylinder Line4 - or would you be able to place a piece in mid air (next to a edge of the board which is not really there.)