Use turbo mode (shift-click flag) to improve dragging. 'R' to reset a level. Sometimes a level will break, so 'R' will be necessary. I basically copied the mobile game "Flow Free." Your goal is to drag lines of the same color together without having any of the lines overlap. You can undo a line by dragging it back on itself. Mobile compatible assuming a level doesn't break. Don't press space because it is used to cheat and cheating is bad.