

Happy Nuclear
Hi-Develop · June 10, 2025 · Immersive Sim, Incremental, Puzzle, Investigation, Detective
Buy Happy Nuclear from Steam at $4.99 — the cheapest of 1 store we compare.
Where to buy Happy Nuclear — official stores
Happy Nuclear price by region
Happy Nuclear costs $3.29 in Georgia (USD), £4.29 in the United Kingdom, $4.99 in the United States, €4.99 in Europe (EUR), CA$6.49 in Canada, NZ$7.39 in New Zealand, A$7.50 in Australia, R$16.99 in Brazil and zł22.99 in Poland right now.
| Region | Best price | Official store | Key shop | Stores |
|---|---|---|---|---|
| $3.29 | $3.29 | — | 1 | |
| £4.29 | £4.29 | — | 1 | |
| $4.99 | $4.99 | — | 1 | |
| €4.99 | €4.99 | — | 1 | |
| CA$6.49 | CA$6.49 | — | 1 | |
| NZ$7.39 | NZ$7.39 | — | 1 | |
| A$7.50 | A$7.50 | — | 1 | |
| R$16.99 | R$16.99 | — | 1 | |
| zł22.99 | zł22.99 | — | 1 |
Each row is a real price from that region's own stores, not a currency conversion, so the figures are not directly comparable. Switch regions in the header to shop the one you buy in.
Screenshots
About Happy Nuclear
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
Happy Nuclear — game info
- Platforms
- Windows
- Player modes
- Single-player
- PC Game Pass
- Not included
What Steam players say
Recent verbatim reviews from Steam — separate from playze.io community reviews below.
Happy Nuclear is a digital take on the logic grid puzzle, drawing clear inspiration from Sudoku-style deduction. You play as a detective tasked with uncovering who is planning to destroy the world with nuclear weapons. By analysing CCTC systems and room usage logs, you must track the movements of various suspects and piece together who is involved in the plot. Each level is randomly generated, giving the game strong replayability, and the inclusion of leaderboards adds a competitive edge by letting you compare your performance with other players. That said, the game is not without its frustrations. The user interface feels somewhat clunky, and the integration of its tools could be smoother. You are limited to just two attempts per level before it resets, which can be discouraging if you are unsure of the solution or still trying to fully understand the puzzle, as it often means repeating the same work. Laying out blueprints and tracking movements can also become a little tedious over time. Despite these issues, I still had a good time with Happy Nuclear. It’s an enjoyable and charming logic game that, while rough around the edges, offers a satisfying puzzle experience over…1 found this helpful
6/10 Deduction puzzle TLDR: it's somewhat like Sudoku or Einstein puzzle, in the theme of crime solving. The main difficulty however comes from the clumsiness of the UI. It requires too many clicks and doesn't present the info comfortably. Good: + nice core idea: suspects are in different rooms at different times, and you need to compare CCTV logs with room usage logs (which may have "?"s instead of character names) + thematic spy/detective music + puzzle levels are randomly generated, so you can replay them with a different setup each time So-so: +/- some typos in English text Bad: - checking CCTV or room usage logs requires 5 clicks each time (!): select the room in a drop-down list (2 clicks), then select the time or the person in the drop-down list (2 clicks), then press "Search" (1 click). This turns the game into a slog The obvious UI re-design here would be this: 2 tables on the sides of the screen. The 1st table has rooms for columns and times for rows, and cells contain a list of portraits each. The 2nd table has rooms for columns and rows for persons, and cells contain a list of numbers each (times). That's it. No "search" button or drop-down lists needed, and all…1 found this helpful
The answers don't make sense. Even ChatGBT could not figure out the answer to chapter 4.1 found this helpful
Use your brain, have fun, I recommend you to play.
This is a unique puzzle game with its own distinctive style. It might look complicated at first with all the maps and token placement, but once you understand the core mechanics, you don't need to draw out every hour or keep track of every character's position. This makes the leaderboard competition much more meaningful and skill-based. However, I don't think it's very suitable for casual players since it requires quite a bit of brainpower.
It's... not really fun. Solving the puzzle genuinely is incredibly tedious. the optimal way to solve most scenarios is to spawn a number of maps equal to the hours, then click on each of the 6 character tokens for each map you spawn and slowly cycle through the dropdowns to get each room's information and place where everyone is in each hour. Maybe it'd be a little more bearable if you could group select and copy-paste (copy-paste 1 single object is functionally no different than clicking the spawn button, dunno why it's an "advertised feature") or spawn a group of all relevant objects with 1 button instead of 7, or if each hour's room locations was a single sheet (perahaps with the "obscured" info scratched or blacked out. The drop downs don't really add anything. The scoreboards are a terrible implementation since most of them come down to 1 multiple choice question; they reward just taking a blind stab and I think time is the only scoring factor? if there was a mid I'd vote that since it works fine enough but I think 6 procgen puzzles aren't worth it.
Community reviews
0 reviews
Sign in to write a review.
No reviews yet. Be the first to review this game.
More like Happy Nuclear
News
PCFinal Fantasy XI price: what you pay, then keep paying
The Final Fantasy XI price is two numbers, and the subscription is the one that matters. Our tracked low, what the Ultimate Collection includes, and when buying at list is correct.
Oct 16, 2026
PCCastlevania Belmont's Curse price: which edition to buy
The Castlevania Belmont's Curse price splits in two: Steam charges full list, authorised resellers a quarter less. Our record says that 25% has not moved since June, and is the floor.
Oct 16, 2026
DealsHogwarts Legacy price history: where the floor really is
Our Hogwarts Legacy price history runs to 100 daily readings and a $3.99 median. Why the sub-dollar figure in search results is noise, and what to actually pay.
Oct 15, 2026
PCEnshrouded price after 1.0: what it costs now
Enshrouded hit 1.0 today, but the Enshrouded price rose on 8 September and the key resellers have not followed. What our nine tracked sellers show, and whether to buy now.
Oct 15, 2026
PCStarfield price history: the sub-$20 window, and who set it
Our Starfield price history shows one reseller set the all-time low over five weeks in late summer 2026. What a good price looks like now, and why Game Pass comes first.
Oct 14, 2026
PCBoltgun 2 price: buy the sequel, or the cheap first game?
The Boltgun 2 price has no cheaper route on launch day — our record shows one listing, unmoved since September. The first game is the bargain, but a smaller one than it was.
Oct 14, 2026
PCRust price: why the cheap keys vanished, and when to buy
The Rust price has two answers: an official one that barely moves, and a reseller one that sat in single digits for 95 days and then disappeared. Our record shows both.
Oct 13, 2026
PCPlanet Zoo 2 price: which edition, and when it gets cheaper
Planet Zoo 2 is out today. The Planet Zoo 2 price splits two ways, the cheap pre-order keys stopped existing three weeks ago, and the original got dearer as the sequel landed.
Oct 13, 2026
PCTekken 8 ღირს თუ არა: 91 ქულა და შერეული შეფასება
Tekken 8 ღირს თუ არა, როცა კრიტიკოსებს 91 ქულა აქვთ დაწერილი, მოთამაშეებს კი „შერეული"? ფასი, ონლაინის მდგომარეობა და უკეთესი ალტერნატივა.
Sep 24, 2026
DealsStellaris იაფად: ოცდახუთი დამატება და ერთი გამოსავალი
Stellaris იაფად ყიდვა საბაზისო თამაშის შემთხვევაში მარტივია. ძვირი დამატებებია — და მათთვის არსებობს ვარიანტი, რომელსაც ბევრი ვერ ამჩნევს.
Sep 24, 2026
PCARK ფასი: Evolved თუ Ascended — რომელი ვიყიდოთ
ARK ფასი ორი სხვადასხვა თამაშის ფასია. რომელი ჯობია ქართული სიიდან, სად არიან მოთამაშეები და რატომ არ ღირს ახალ ვერსიაზე გადახტომა.
Sep 24, 2026
DealsCivilization 6 იაფად: რომელი დამატება ღირს მართლა
Civilization 6 იაფად ყიდვა მარტივია — საბაზისო თამაში იაფია და იაფად რჩება. რთული ის არის, რომ ცხრამეტი დამატებიდან სწორი აირჩიოთ.
Sep 24, 2026
FreebiesCS2 უფასოდ: რა ღირს სინამდვილეში Prime
CS2 უფასოდ ითამაშება საქართველოდანაც და ეს დემო არაა. ფული მხოლოდ Prime-ს სჭირდება — აი, რას იძლევა ის და ვის ღირს.
Sep 24, 2026
PCCuphead ღირს თუ არა: სირთულე, DLC და ორზე თამაში
Cuphead ღირს თუ არა: ექვსივე ქართულ მაღაზიაში ერთი ფასია, მეგობარს კი ასლი საერთოდ არ სჭირდება. სირთულე, ერთადერთი დამატება და როდის ვიყიდოთ.
Sep 23, 2026
DealsRimWorld იაფად: ბაზა, ხუთი დამატება და სწორი რიგი
RimWorld იაფად ყიდვა დამატებების რიგზეა დამოკიდებული, არა ფასდაკლების ლოდინზე. რომელი ხუთიდან ღირს ჯერ და რომელ მაღაზიას აქვს ფასდაკლება.
Sep 23, 2026
PCPhasmophobia ფასი: ოთხი ასლი და ერთი მაღაზია
Phasmophobia ფასი ქართულ სიაში მხოლოდ ერთ მაღაზიაში ჩანს, თამაში კი ოთხზეა გათვლილი. რატომ ღირს ფასდაკლების დალოდება და რა გჭირდებათ დასაწყებად.
Sep 23, 2026Top games right now
All rankings →- 1Counter-Strike 2Free
- 2Dota 2Free
- 3PUBG: BATTLEGROUNDSFree
- 4Grand Theft Auto V Legacy—
- 5Terraria$2.16
- 6Rust$25.85
- 7Team Fortress 2Free
- 8Black Myth: Wukong$36.52
- 9HELLDIVERS™ 2$25.07
- 10ELDEN RING$49.41
- 11Apex Legends™Free
- 12Left 4 Dead 2$9.99
- 13Stardew Valley$13.81
- 14Wallpaper Engine$3.99
- 15Euro Truck Simulator 2$9.89
- 16Dead by Daylight$6.84
- 17Red Dead Redemption 2$11.00
- 18Baldur's Gate 3$57.57
- 19Phasmophobia$17.30
- 20War ThunderFree
- 21Call of Duty®—
- 22ARK: Survival Evolved$13.48
- 23Among Us$2.99
- 24The Forest$19.72
Buy at Steam 










