Ocnus Theory
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About Ocnus Theory
Ocnus Theory is a challenging 3D platformer about climbing toward a peak after being banished. You navigate a sandbox environment, using careful movement and creativity to get past obstacles. Along the way, you may uncover why you were banished and what Ocnus are.
Adapt to the climb
Pick up blocks, fruit, fish and other objects and attach them to your core to change your physics, size and shape. Rearrange yourself to tackle different obstacles, such as thin cliffs, and take care not to send useful objects into the sea below. The physics-based platforming makes every movement important, as a fall can happen at any moment.
Challenges have no single solution, so you can experiment with the objects around you. The climb passes through many diverse regions, each with its own themes and challenges. Checkpoints help with the difficult ascent, while harder difficulties limit the number of blocks and checkpoints available. Legendary Mode has no checkpoints.
Modes and rewards
A challenge mode offers unlockable micro challenges that you can complete outside the main game. You can also unlock colors and hats to customize your appearance. Fishing involves ramming into fish and attaching them to yourself.
The climb's secrets
The world has a darker side beneath its appearance. Reaching the peak may reveal truths that some would rather keep secret, as you climb amid a mountain of corpses toward your full potential.
Frequently asked questions
The best price for Ocnus Theory is $9.25 at Kinguin. That is 22% less than on Steam, where it costs $11.99. 3 shops have an offer that activates in your country.
Some are. This page only shows offers that activate in your country; offers for other regions, or with no stated region, are left out. To see the offers for another country, change your country at the top of the page.
Every key we list activates on Steam. Redeem the key there and Ocnus Theory stays in your library for good.
Yes, with a small risk. Publishers create keys to sell in other shops, which is why a key can cost less than in the official store, and once you activate it the game is yours to keep, just like a store purchase. On average 1–2% of keys fail, so check the shop's buyer protection before you buy: the official store does not refund keys bought elsewhere.
The minimum requirements for Ocnus Theory are: Windows 7, GeForce GTX 960, AMD Ryzen 3 3300X, 6 GB RAM, 600 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.
No. Ocnus Theory is a single-player game.
Yes. Valve rates Ocnus Theory as Verified on the Steam Deck: it runs well out of the box.
Buy Ocnus Theory 22% cheaper than on Steam.
Ocnus Theory is available for 22% less in shops such as Kinguin or Electronic First.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.











