Public officials around the world are aware that solutions on public problems need a closer relation to citizens. The era of a government in isolation that has all the answers is ending. More and more co-production, collaboration and peer production concepts are emerging on public management conversations. But there is very little evidence of these joint projects using technology. Open innovation in governments is a recent research field in Mexico. This paper reports the case of the use of open innovation in Mexico City's transportation system, named Mapaton (large map), using gamification to engage citizens in order to map transportation routes using a smartphone App. With the model Open Innovation Process Phases proposed by Mergel, we interviewed six persons --public officials, citizens, academics -- from the Mapaton coordinator team. We found that an innovation process is an iterative work and requires a preliminary stage of building trust between governments and citizens. Also the result of this research argues that this combined effort will change.

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