Orbis Atomus vs Underground
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Orbis Atomus
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ORBIS ATOMUS Chain Reaction Merge atoms. Create elements. Chase the perfect chain. Place atoms on the ring and use the powerful + to fuse matching pairs into higher elements. Start with simple Hydrogen, work your way up through Helium, Carbon, and beyond. One wrong move fills your ring. One perfect chain clears it. SIMPLE RULES - Tap to place atoms on the ring - + merges two matching neighbors into the next element - - lets you reposition any atom - Ring full? Game over. DEEP STRATEGY - Set up chain reactions for massive scores - Save your for emergencies - Balance risk and reward with every placement - Learn the patterns, master the chains SATISFYING GAMEPLAY - Watch elements transform in beautiful chain reactions - Clean, minimalist design - No ads interrupting your flow - One more game... just one more From the creators who love puzzle games that respect your time. No tutorials that take forever. No energy systems. No pay to win. Just pure, distilled puzzle satisfaction. How far can you go? Can you reach Gold? Download now and start your atomic journey.
Underground
Manage a post-apocalyptic underground bunker, balancing resources, people's needs, and external threats. Build rooms, accept survivors, and guide your community's development through strategic decisions and mini-games.
- Build and manage over 40 types of rooms
- Balance essential resources like food, water, and energy
- Manage individual survivor skills, health, and stress
- Accept or reject new survivors at your gates
- Explore tunnels, gather loot, and trade with friends
- Engage in mini-games for resources and event outcomes
- Play offline with time pausing when the app is closed
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The world has fallen. You are the last hope for those knocking at your gates. Underground is a deep bunker-management sim where every decision echoes through your food, water, power — and your people's spirits. Build compartments across three floors, take in survivors at the airlock, keep your resources in balance, and don't let the bunker go dark. What's waiting for you: • A living bunker — 40+ compartment types: generator room, farm, med bay, laboratory, armory, district map, the old metro and more. Every room works differently and demands your attention. • Resources with consequences — power, water, food, air, parts, fuel. Run out of water and newcomers will walk right past your gates. Overheat the generator and an accident is only a matter of time. • People, not numbers — every resident has skills, health, stress and relationships. Quarrels, illness, theft, panic — incidents won't wait: you have limited time to solve a problem before it gets worse. • Arrivals at the gate — survivors keep coming to the airlock. Let them in, turn them away, or send them off with rations? Your bunker's reputation decides who shows up tomorrow. • Your own path — fortress, radio contact, autonomy, science, evacuation or a return to the surface. Goals will show you where to grow next. • The metro and recon — explore the tunnels, gather loot, trade with friends and fight off threats in the corridors. • Mini-games that matter — harvest crops, repair equipment, calm a panic: quick games earn resources and change how events end. • Friends in the game — add friends, meet their survivors at your gates, exchange resources and earn bonuses for playing together. • Play at your own pace — minimize the app and time in the bunker stops. Come back and pick up right where you left off. Who this game is for: If you love Fallout Shelter, This War of Mine, or management games with personality — this one is full of "what if I try it this way?" moments. Not a five-minute arcade, but a bunker that grows with you. Download. Open the airlock. Decide who gets in first.
Screenshots
Verdict
The clearest difference is in-app purchases: Orbis Atomus at none against Underground's 5. Orbis Atomus also leads on ads (none vs shown) and iOS requirement (15.1 vs 17.6). Underground's advantage is chart position (#142 vs unranked). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Underground sells 5 one-off in-app purchases. Orbis Atomus asks for nothing beyond the download.
| Parameter | Orbis Atomus | Underground |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (6 ratings) — better |
| Positive reviews | — | 72.5% of reviews |
| Number of ratings | — | 6 — better |
| Update frequency | — | Every 3 days |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Paid |
| Best chart rank | — | #142 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 29 MB | 35 MB |
| Age rating | 4+ | 9+ |
| Developer | Martin Edmaier | Sunspear Software LLC |
In-app purchases
Orbis Atomus
No in-app purchases
Underground
- Parts Crate (Small)$0.99
- Parts Crate (Medium)$1.99
- Supply Crate (Mixed)$1.99
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- Support the Shelter$2.99
- Parts Crate (Large)$3.99









