All aboard the worlds first mathematical railway! Logical Deduction, Numeracy, Sequencing, Spatial Awareness, Visual Perception Each of the twelve track tiles features a number. Use the clues and the tiles that will allow you to add or subtract the numbers to create your target number. Then connect the tracks to solve the puzzle! There are 40 puzzles to challenge you, with four levels of difficulty and once youve finished building each puzzle, your wind-up train will run along the tracks. 40 multi-level puzzles • No batteries required • 12 durable track pieces