Introduction While Theory of mind (ToM) impairments have been well established in schizophrenia (SZ), very few studies have investigated these impairments during social interactions. However, in daily life the attribution of mental states to others (ToM) is most often implicit and spontaneous whereas classical ToM tasks rely on explicit, deliberate and cognitively-demanding reasoning. Objective The aim of the present study was to fully characterize ToM ability in schizophrenia by investigating this ability during a collaborative game. Methods Ten individuals with schizophrenia (SZ) and ten healthy control (HC) participants were recruited. Patients' severity of symptoms was measured using the PANSS. All participants were asked to play a collaborative game with an experimenter. During this game, the aim of the participant was to transfer a given route from his/her map to his/her interlocutor. The prosodic focus marking was used as a linguistic marker of ToM. Participants were also submitted to a classical ToM task requiring explicit attribution of mental states and to a neuropsychological evaluation. Results The results showed that, by contrast to HC participants, SZ patients did not produce prosodic focus marking revealing difficulties to attribute knowledge to their interlocutor during the collaborative game. SZ patients were impaired on both explicit and implicit ToM assessment. No correlation was found between the ToM abilities and the symptoms or the neuropsychological evaluation. Conclusions Thus, the interactive task we used appears to be an original option for studying ToM ability in schizophrenia since it is close to what happens in real-life interactions.