My Big Sister: Steam price vs key
My Big Sister costs €1.77 as a key at BuyCheapKeys, versus a regular price of €5.89 on the Steam Store: you save €4.12 (70% 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 My Big Sister now? A steal: buy it now
The key costs €4.12 less than the regular Steam price and is at its lowest recorded price. With 94% positive reviews, it's a safe buy.
Price score: 10/10 · The key is 70% 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 My Big Sister keys
1 offer, sorted by price
- €1.77Buy
My Big Sister
CheapestSteam keyGlobal-€4.12 compared with the Steam regular price
My Big Sister price history
- Steam regular price€5.89
- BuyCheapKeys key€1.77
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 My Big Sister key
- 1
Buy the key
Choose the My Big Sister 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.
My Big Sister FAQ
›How much is My Big Sister on Steam?
The regular Steam price of My Big Sister is €5.89. At BuyCheapKeys the Steam key costs €1.77, €4.12 less.
›Where to buy My Big Sister cheapest?
The cheapest option is the BuyCheapKeys Steam key for €1.77, 70% below the regular Steam price. Instant delivery and it activates on Steam.
›Is the My Big Sister key the same game as on Steam?
Yes. When you redeem the key, My Big Sister 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 My Big Sister at BuyCheapKeys?
The lowest recorded price for the key at BuyCheapKeys is €1.77 (October 4, 2026). Today it costs €1.77.
›Will the My Big Sister 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.
›Does My Big Sister work on Steam Deck?
Valve rates it “Playable” on Steam Deck. Once the key is activated on Steam you can play it on Steam Deck just like on PC.
›Is My Big Sister worth it?
It has 94% positive reviews out of 542 on Steam (“Very Positive”), was released in 2018 and is developed by Stranga Games. Genres: Indie, Adventure, Pixel Graphics, Story Rich.
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My Big Sister
€1.77