Big Sister — cheap CD keys, compare prices
Is it worth buying?
- The price is above its low (was €0.87), 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
Big Sister (HaHaHaGame) — Casual, Indie. On this page we track CD key prices across editions, regions and activation platforms from trusted sellers, with price history and a DLC overview.
Best price today
€1.09
lowest in tracked period: official €0.87 (+25%)
The cheapest Big Sister key right now costs €1.09 at Steam. The lowest price we have recorded for this game: €0.87.
The average low over the past 2 months was €0.87.
Prices as of
Steam best price Official store
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
Lowest — official stores
€0.87
Sept 2026
Price history
last 10 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €0.87 | — |
| Sept 2026 | €0.87 | — |
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
Price alert Catch alert Price alert
Confirm in our Telegram bot — no account, no spam.
All-time low so far: €0.87
System requirements
| Minimum | |
|---|---|
| OS | Windows 7 |
| Processor | i5 |
| Memory | 400 MB RAM |
| Graphics | Intel HD Graphics 4400 |
| Storage | 400 MB available space |
Similar games
About this game — FAQ
Can Big Sister be played single-player?
Yes, Big Sister is a single-player game.
What languages does Big Sister support?
Big Sister is available in: English, French, Italian, German, Spanish - Spain, Danish, Ukrainian, Russian and 22 more.
Does Big Sister use Steam Cloud saves?
Yes, Big Sister uses Steam Cloud, so your saves sync across devices.
FAQ
Where is the cheapest place to buy a Big Sister key?
The cheapest Big Sister key is currently sold by Steam for €1.09. The lowest price we have ever recorded for this game: €0.87.
How much does Big Sister cost?
Big Sister currently costs from €1.09 — 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.