Happy Nuclear
Release date: Jun 9, 2025
Developers: Hi-Develop
Publishers: Hi-Develop
Genres: Casual, Indie, RPG, Simulation
Categories: Single-player, Steam Achievements, Steam Cloud, Steam Leaderboards, Family Sharing
Supported languages: English, Thai

Happy Nuclear Happy Nuclear is a challenging puzzle investigation game that tests your thinking skills. Players take on the role of a detective who becomes involved with a terrorist organization planning to destroy the world with nuclear bombs. You must use logic and problem-solving skills to investigate and stop this organization before it's too late. Gameplay Mechanics Players need to identify the culprits by piecing together incomplete information to reconstruct a complete picture of events at the crime scene. The game system feels similar to Sudoku, but instead of filling in numbers, you're creating movement patterns of suspects at the crime scene. In-Game Information Sources 'CCTV Smart Detection System' - This system provides partial information about who used rooms at specified times. 'Room Usage Log' - This system provides partial information about how many times a specified suspect entered this room. Game Rules (Golden Rules) Happy Nuclear has 2 fundamental rules that apply throughout the game: Everyone must move only to adjacent rooms - skipping rooms is not allowed. No one can stay in the same room for more than 1 hour. Hotkeys make gameplay more fun Press number keys 1-0 to pull out tokens and tools. Press Delete to remove tokens and tools. Copy and paste tools with Ctrl+C / Ctrl+V. Quick access the applications: Press 'Q' to open logs, 'W' to open CCTV