Cartesian Battle — cheap CD keys, compare prices
Is it worth buying?
- The price is above its low (was €4.24), but within a reasonable range. Notify me on a drop →
Estimate based on public reviews (Metacritic/Steam) and price history — the final call is yours.
About the game
Cartesian Battle is an educational indie title that blends mathematics with a wartime setting. Players rely on different mathematical functions to chart the path of their shots while fulfilling their role as a fighter. The game was developed and published by Papitas Studio in 2026.
Best price today
€4.49
all-time low: official €4.24 (+6%)
The cheapest Cartesian Battle key right now costs €4.49 at Steam. The lowest price we have recorded for this game: €4.24.
The average low over the past 4 months was €4.49.
Prices as of
Steam best price Official store
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Listed seller price shown — payment fees may vary by method.
Lowest — official stores
€4.24
Jul 2026
Price history
last 89 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €4.49 | — |
| Sept 2026 | €4.99 | — |
| Aug 2026 | €4.24 | — |
| Jul 2026 | €4.24 | — |
Lowest in-stock price per month from our price history; the current month is the low so far.
How to activate your key
- Steam key — open the Steam client → Games → Activate a Product on Steam → enter the key. Stores with this activation: Steam
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All-time low so far: €4.24
System requirements
| Minimum | Recommended | |
|---|---|---|
| OS | Windows 10 (64-bit) | Windows 10 or Windows 11 (64-bit) |
| Processor | Dual Core 2.0 GHz | Quad Core 2.5 GHz or higher |
| Memory | 4 GB RAM | 8 GB RAM |
| Graphics | DirectX 11 compatible graphics card | DirectX 11 compatible graphics card or better |
| DirectX | Version 11 | Version 11 |
| Storage | 140 MB available space | 140 MB available space |
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About this game — FAQ
Can Cartesian Battle be played single-player?
Yes, Cartesian Battle is a single-player game.
What languages does Cartesian Battle support?
Cartesian Battle is available in: Portuguese - Brazil, English.
Does Cartesian Battle use Steam Cloud saves?
Yes, Cartesian Battle uses Steam Cloud, so your saves sync across devices.
FAQ
Where is the cheapest place to buy a Cartesian Battle key?
The cheapest Cartesian Battle key is currently sold by Steam for €4.49. The lowest price we have ever recorded for this game: €4.24.
How much does Cartesian Battle cost?
Cartesian Battle currently costs from €4.49 — the cheapest offer across the stores we track.
Is Steam an official store or a keyshop?
Steam is an official store — keys come directly from the publisher or an authorized distributor.
Are keys from these stores legal?
Buying is legal — keys come from the grey market, so a small deactivation risk exists. So before paying, check the seller's buyer protection.
Which key region should I pick?
Global activates everywhere. Regional keys (Europe, North America, RU-CIS) only work on accounts from that region — use the Region filter to match your account.
What is an activation platform?
The service where the key activates — Steam, GOG, Epic or the publisher's platform. A key for one platform won't work on another, hence the separate filter.
What's the difference between editions?
Standard is the base game; Deluxe usually adds an expansion or bonus content. The edition filter shows exactly that variant, with no mixed prices.