Hop over to Amazon and get a deal on 140-Piece fischertechnik Dynamic S Building Kit. The ball starts in the obstacle course and accelerates until it reaches the cross-over, where it drops further before racing down two different tracks – to the left and to the right! In the title model, the ball flies through … Continue reading 140-Piece fischertechnik Dynamic S Building Kit $11.99 (Reg. $30) – 2K+ FAB Ratings! Build 3 Models!