Onyx: Steam price vs key
Onyx costs €2.08 as a key at BuyCheapKeys, versus a regular price of €9.99 on the Steam Store: you save €7.91 (79% less). The key activates on your Steam account and it's exactly the same game (prices from October 4, 2026).
- Instant deliveryKey by email and in your account
- Full guaranteeReplacement or refund
- Secure paymentCard, PayPal, Google Pay, Apple Pay
- Activates on SteamSame game in your library
- Up to 4% cashbackWith the VIP Club
Should I buy Onyx now? A steal: buy it now
The key costs €7.91 less than the regular Steam price and is at its lowest recorded price.
Price score: 10/10 · The key is 79% below the regular Steam price.
The same game, for less
A Steam key gives you exactly the same as buying on Steam. Only the price changes.
Available Onyx keys
1 offer, sorted by price
- €2.08Buy
Onyx
CheapestSteam keyGlobal-€7.91 compared with the Steam regular price
Onyx price history
- Steam regular price€9.99
- BuyCheapKeys key€2.08
We've been tracking this game since October 3, 2026. The chart will appear once there are a few days of data.
How to activate the Onyx key
- 1
Buy the key
Choose the Onyx offer and pay. You get the key instantly.
- 2
Open Steam
Go to “Games” › “Activate a Product on Steam”.
- 3
Redeem and play
Paste the key and the game stays in your library forever.
Onyx FAQ
›How much is Onyx on Steam?
The regular Steam price of Onyx is €9.99. At BuyCheapKeys the Steam key costs €2.08, €7.91 less.
›Where to buy Onyx cheapest?
The cheapest option is the BuyCheapKeys Steam key for €2.08, 79% below the regular Steam price. Instant delivery and it activates on Steam.
›Is the Onyx key the same game as on Steam?
Yes. When you redeem the key, Onyx is added to your Steam account with achievements, cloud saves and updates, just as if you bought it on Steam.
›What is the lowest price for Onyx at BuyCheapKeys?
The lowest recorded price for the key at BuyCheapKeys is €2.08 (October 4, 2026). Today it costs €2.08.
›Will the Onyx key work in my country?
We list Global and Europe region keys. Each BuyCheapKeys product page tells you whether it can be activated in your country before you buy.
›Is it safe to buy from BuyCheapKeys?
Yes. Delivery is instant by email and in your account, we accept card, PayPal, Google Pay and Apple Pay, and every purchase is covered by a replacement or refund guarantee.
›Is Onyx worth it?
It has 56% positive reviews out of 37 on Steam (“Mixed”), was released in 2017 and is developed by Valkyria Games. Genres: Adventure, Casual, RPG, Indie.
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Onyx
€2.08