This is a well designed logic puzzle app with really good instructions, smart scaffolding, and fun variability. In Trainyard Express, you use your fingers to draw tracks between a starting station and an ending station. At first, it may seem like a trivial game, but as the program introduces multiple trains, track switching, color switching, obstacles, and other challenges it becomes an extremely brain-busting engagement.
I have only been playing the free version, and after about 30 levels I still have not reached a point where I need to pay to play more levels. You get an unlimited of attempts to solve the puzzle, and you can vary the speed at which your test runs go to really observe the motion and direction of the trains on the tracks you design.
Header photo by Robert S. Donovan