Level-5 is showcasing its upcoming detective RPG at Tokyo Game Show 2026 with a demo for DECAPOLICE. The showcase, which focuses on a case titled “The Three Mafioso Murders,” provides a detailed look at the game’s dual-reality investigation mechanics and turn-based combat systems.

DECAPOLICE is preparing for a multi-platform launch on PlayStation 5, PC via Steam, and the Nintendo Switch 2.

Navigating Decasim and the Case Board

The “Three Mafioso Murders” demo highlights the central gameplay loop of investigating crimes within “Decasim,” a virtual world that serves as a perfect digital replica of reality. To manage the mature themes of crime scenes while maintaining the game’s distinctive aesthetic, the avatars within Decasim—including protagonist Harvard and his team—transform into cutesy, stuffed animal-like personas.

Investigation revolves around the “Case Board,” where players must organize gathered evidence, testimonies, and visual clues to reconstruct the timeline of a crime. Players must find contradictions in the virtual data and connect clues to identify the culprit before moving the investigation toward a final confrontation.

Combat and Crime Beasts

Once a suspect is identified, the gameplay shifts into a turn-based combat system. According to RPGFan, suspects who are cornered by the police can transform into “Crime Beasts,” physical manifestations of their malicious intent. The battle system requires players to utilize the unique abilities of Harvard’s team to weaken these beasts and eventually perform an arrest.

The combat emphasizes tactical positioning and the use of specialized police equipment. While the investigation phase is cerebral and methodical, the battles serve as a high-stakes conclusion to each case. Level-5 has previously indicated that this hybrid approach is designed to blend traditional RPG progression with the narrative depth of a detective thriller.

The developer appears focused on expanding the scope of Decasim and ensuring the logic-driven “Case Board” interactions are polished for the next generation of hardware. The inclusion of the Nintendo Switch 2 in the confirmed platform list suggests the title is being optimized to take advantage of upgraded hardware capabilities alongside its PC and PlayStation counterparts.