This is the PC version and activates on Steam.
Use Hola extension in Chrome and switch to US then apply code 'BONUS28' to get this price.
Without Hola the price is £12.96 with 'BONUS28' code.
Apparently this discount code will expire after 1000 uses. If the code no longer works for you then use SUPERNOVA25 for 25% off, only 3% less discount.