Pathmaker

Build paths to get all of the carts from one side to the other. You'll need to cross tracks, avoid obstacles, and make sure the carts don't collide. You can even turn sections of track into slow paths or turbo. The levels start basic but get progressively harder - 130 levels in all. And for extra challenges, there are 3 random level generators to keep the puzzles coming. Stunt Monkey Games promises this game has no ads and no in-game purchases, and all future updates will be included for free.