DLC · requires the base game: Serum: Toxic Survival
Serum - Official Guide
Game Island
ActionAdventureIndieSimulation
Steam key: you activate it in your Steam account. How to activate it
Price comparison
1 offer
$9.99
StandardNorth America
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Serum - Official Guide: price summary
Right now the best price for Serum - Official Guide is $9.99, on Steam. We haven't found it in any key store, so for now it is only sold on Steam. Since July 2026, its lowest price on Steam in Europe was €2.49 (July 21, 2026). Steam has discounted it 2 times in that time.
- Developer
- Game Island
- Type
- DLC / add-on
Price history
Steam prices in Europe, in euros: the history is recorded on Steam Spain.
Screenshots
About Serum - Official Guide
Equip yourself with essential knowledge and expert advice with the digital guidebook.
