This is very fun logical game with drain and pipe system. You can complete the pipe system with the 3 different pipe piece. The simple line pipe, the bend pipe and the cross pipe, the cross pipe working only on horizontal or vertical line. All pipe piece is rotating in the green plane, this is the usable piece, what yuo can use on the wall-grid, and you also see the next pieces for the good game strategic. What you see on the green zone (bottom of the preview line) this piece is usable on the grid, you tap on the grid, the piece is snapping - connecting. If you screw up the connecting with bad piece, this is not problem, if good item visible on the green plane, tap on the bad piece and already good the connection. You can drop the bad item with the trash icon. 40 fantastic level, good challenge. All level random generated, don't have two same complete game. Have a fun, enjoy the game!