While next month's Serious Sam 4 is potentially on your mind, it's worth popping over to GOG to claim a free copy of the original 2001 FPS. You'll find a giveaway banner near the middle of the main page.
Serious Sam: The First Encounter is dated in a lot of ways, but there's a certain everlasting charm to a game like this, especially if you're only looking to breeze through a few levels for old times' sake. Get in, blast the monstrous hordes to bits, and get out – it doesn't have to be any more complicated than that.
The freebie is part of a wider Harvest sale on GOG. It's being offered until August 26 at 6:00 a.m. Pacific.
While we're in the circle-strafing mood, it's worth watching Ars Technica's War Stories video on Serious Sam with Croteam founder Davor Hunski. It's such a digestible format for a behind-the-scenes show.