Green Man Gaming, the online retailer based in the U.K., launched its 666 sale this morning, which will offer six discounts of up to 75 percent every six hours for the next six days, according to the sale's listing online.

The 666 sale's first round kicked off at 11 a.m. ET today and will end at 4 p.m. ET. Discounts and links to the downloadable PC games include the following:

Those who enter the coupon code GMG10-U49LX-GAE17 at checkout can save an additional 10 percent, according to Dealzon.

Last week, Green Man Gaming launched a trade-in program that offers instant credit for console games.