This game is excellent and very realistic. The car is very well designed, there are several sizes of screws that require the child to think, the order of assembly and disassembly of parts is also taken into account. Only drawback, the product is not proof case: in fact screws and car threads tend to screw up easily when the child uses force or is too big in too short thread . Result: I have aims that do not fit in place and the plastic thread is completely eaten, having forced my son just days after discovering the game.