This paper presents "Home game," a multimodal interactive educational game that supports training in independent living for children with cognitive disabilities. It is intended to be used under the supervision of educators in a rehabilitation center. The game features a variety of exercises that incorporate multimedia, virtual environments, tangible, and playful interaction to facilitate learning of the main rooms of a house, daily routines, and how to avoid inappropriate or prevent hazardous behaviors. It enhances touch-based interaction with physical manipulation through printed cards on a tabletop setup, using a webcam to recognize and track cards on a board. This paper describes the system, along with the development process and the results of a preliminary user-based evaluation. Furthermore, it reports the insights and lessons learned throughout the process of developing tangible educational technologies for children with cognitive impairments, in terms of functionality, interaction, and evaluation with children.