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Compound Interest
Build your atomic empire. Fuse elements, craft real compounds, trigger chain reactions, and break the periodic table wide open in an idle game where chemistry IS the strategy.

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English ✔

Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Compound Interest already has its complete core progression loop, but its large number of interacting systems creates a substantial balancing challenge. Early Access will help refine progression, improve clarity, expand the available strategies, and shape the endgame using real player feedback.”

Approximately how long will this game be in Early Access?

“Currently expect Early Access to last approximately 6–12 months, depending on player feedback and the amount of balancing and refinement required.”

How is the full version planned to differ from the Early Access version?

“I plan to expand the current library of 45 compounds, deepen the endgame, develop more element traits into meaningful mechanics, and further refine progression, automation, onboarding, readability, accessibility, audio, and overall presentation. Community feedback will help determine which additions and improvements receive the most attention.”

What is the current state of the Early Access version?

“The core game is playable through repeated Big Bang prestige cycles. It currently includes all 118 elements, 45 craftable compounds, dynamic fusion, compound loadouts and synergies, decay chains, reaction events, research and repeatable upgrades, automation, table-completion bonuses, save/load, and up to 24 hours of offline progress. A tutorial, objective guidance, help system, settings, music, and sound effects are also implemented. Balance, endgame depth, and some element traits remain works in progress.”

Will the game be priced differently during and after Early Access?

“I plan to offer the game at a lower price during Early Access. The price may increase as additional content, features, and polish are added and the game approaches its full release.”

How are you planning on involving the Community in your development process?

“I plan to use Steam Community discussions to collect bug reports, progression feedback, balance suggestions, and ideas for new compounds and strategies. Player experiences, especially where progression feels unclear, slow, or overly dominant will directly inform priorities throughout Early Access.”
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About This Game

You Paid Attention in Chemistry. Time for That to Pay Off.

The periodic table isn't decoration — it's your entire strategy layer. Every one of the 118 elements is a card you collect, deploy, and combine. Fill rows and columns for escalating bonuses. Watch your table light up element by element as you go from tapping Hydrogen to mass-producing Plutonium. If you've ever looked at the periodic table and thought "I could optimize that," this is your game.

If the Math Works, the Fusion Works

Forget memorizing recipes. There are none. Any combination of elements whose atomic numbers sum to a valid target is a legal fusion. Two Hydrogens make Helium. Three Lithiums make Fluorine. There are thousands of valid paths — the system rewards you for finding the clever ones. Got a stockpile of Carbon? Find a way to spend it. The fusion chamber doesn't care how you get there.

Real Compounds. Real Synergies. Disgusting Multipliers.

Craft Water, Ethanol, Steel, TNT, Diamond — over 60 molecular compounds with real chemical formulas. Each compound carries synergy tags: [Oxide], [Organic], [Crystal], [Fuel]. Slot compounds that share tags into your loadout and the bonuses stack hard. This is where the theorycrafting lives. Your compound loadout IS your build, and the best builds will make your numbers do things you didn't think were legal.

Uranium Doesn't Stay Uranium

Heavy elements above Polonium are radioactive — they generate fast, but they're on a timer. When they decay, they transform through real-world decay chains. Uranium cascades through Thorium, Radium, Radon, and more before stabilizing as Lead. Every step fires off an energy burst and leaves a usable element behind. One Uranium card is a time bomb of value.

Blow It All Up. Keep What Matters.

Hit a wall? Trigger a Big Bang. Your elements and compounds reset, but you keep your research, your discovered recipes, and the Cosmic Dust you've earned — a prestige currency that buys permanent multipliers. Each cycle starts faster, pushes further, and earns exponentially more dust. The question isn't whether to prestige. It's when.

Set It and Forget It (Then Come Back to Numbers You Can't Read)

Unlock automation through the research tree — auto-click, auto-fuse, auto-synthesize, auto-compound, and eventually auto-prestige. Start each run hands-on, then lean back and let your atomic factory hum. Close the game entirely. Come back tomorrow to a Welcome Back screen full of scientific notation.

Features

  • All 118 Elements — Unique stats, rarity tiers, and traits inspired by real chemistry

  • Dynamic Fusion — No recipes. If the atomic numbers add up, it works. Thousands of valid paths

  • 60+ Compounds — Real formulas (H₂O, NaCl, C₂H₅OH, Fe₂O₃) with synergy tag stacking

  • Compound Loadouts — Your build, your strategy. Catalyst bays for passive bonuses

  • Decay Chains — Radioactive elements cascade through real decay sequences, generating value at every step

  • Research Tree — Permanent upgrades that survive prestige resets

  • Reaction Events — Combustion, Explosions, Crystallization, and Corrosion triggered by your loadout

  • Discovery Journal — A collectible recipe book with real chemistry facts for every compound

  • Offline Progress — Up to 24 hours of generation while you're away

  • Isotope Variants — Light, standard, and heavy isotopes with different risk/reward profiles

  • Big Numbers — Production scales into scientific notation and keeps going

System Requirements

    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 64-bit
    • Processor: Any dual-core CPU, 2.0 GHz+
    • Memory: 4 GB RAM
    • Graphics: Integrated graphics with OpenGL 3.3 / Vulkan support
    • Storage: 200 MB available space
    Recommended:
    • Requires a 64-bit processor and operating system
    • OS: Windows 11 64-bit
    • Processor: Any quad-core CPU, 2.0 GHz+
    • Memory: 8 GB RAM
    • Graphics: Any dedicated GPU
    • Storage: 200 MB available space
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