Loading…
Happy Nuclear is an evidence-based investigation game where players act as detectives to prevent a disaster. They analyze interconnected case information on an investigation board, primarily using old CCTV and access logs. Cases link together at the end, and each replay introduces changes.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Social Deduction Fest ends
Try this game before buying.
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.
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.
"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.
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.
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
