Unfortunately the game is restricted in my country. Is there other way to buy it?
Vpn
Activation keys would be less problematic I'd sa
In what way is a VPN problematic?
Either buying a good vpn to use it only once to buy a game or risking the IP ban from steam because of free vpn, duh
There's a ton of free VPNs...hell, Opera has one built in and you can turn it off the moment you get done using it.
