INSTANT DELIVERY AFTER PAYMENT.
Publication type: Steam Key (without regional restrictions).
Critical Mass is a puzzle game that takes the usual task of "putting three blocks together" into three—dimensional space! Taking the usual fast gameplay and adding strategy elements to it, we got a completely new feeling from the game.
ACTIVATION

1. You need to download and install Steam http://steampowered.com/download/SteamInstall.msi (if not already installed)
2. Launch the Steam client
3. Create a new Steam account or log in to an existing one
4. Go to the "Games" section and select "Activate on Steam"
5. Enter the activation key you purchased
6. After that, the game will appear in your list of games and you can install it

Attention! Before buying, please check the system requirements of the game. This can be done on the Steam / Uplay / Origin sites or the publisher's official website. Products purchased by mistake, as well as unsuitable for you according to system requirements or activation region, are not subject to return and exchange!

Dear customers! If you have any problems with the purchased product, please kindly contact the seller before leaving a negative review. Report the problem in correspondence with the seller so that the problem can be solved promptly. Please note that the basis for the exchange or return of the purchased key, which gives an error during activation, can only be an unedited VIDEO recording of the activation process.