Not as challenging as it might be – Caboose Express: Patterns and Sorting for Preschool and Kindergarten Review

Without upgrading with inappropriate purchases (and then tweaking settings), this is repetitive and simple - good for the toddler perhaps. The cloying voice is an unnecessary element that can not be turned off. Some kids will find the motivation uninspiring and/or confusing. Animation is minimal.
Review by e_skymac on Caboose Express: Patterns and Sorting for Preschool and Kindergarten.