Autism is a pervasive developmental disorder (PDD) that primarily aects communication, social interaction and behaviors. As part of TGDs there exist other categories, including high-function autism (HFA), considered a light autism within the autistic spectrum. Computer science has many advantages that can be used for the benet of these people, allowing application development to contribute to their specic needs. Among these applications, collaborative multi-touch applications have produced some important results regarding ease of use, interest, motivation, ability to communicate and to improve the social behavior of users with HFA. This work presents a multi-user collaborative game (PAR, acronym in Portuguese for Ask, Help, Receive) using multi-touch designed to assess diferent dimensions of collaboration, developed according to the needs of a user group with a degree of autistic impairment higher than that of the HFA, to contribute in their social interaction. In this sense, four dimensions of collaboration are presented, obtained from the dimensions used in applications designed for HFA and modied according to the requirements of target users. These dimensions are included in PAR and allowed to encourage a collaborative behavior and validate its usefulness both in the social interaction and other difficulties the target users have.