So far I’ve picked up the following games during the various Black Friday sales this year:
Steam:
Age of Wonders: Planetfall Premium Edition (Base game + season pass) - 40% off
Rome: Total War (recommended by @KristiGaines) - 66% off
3030 Deathwar Redux - A Space Odyssey (praised here) - 50% off
Parkitect - 25% off
GOG:
Battle Planet: Judgement Day (Twin-Stick shooter on Mario Galaxy planets) - 40% off
The Bard’s Tale IV Director’s Cut (hyped by @vinraith) - 50% off
Xbox One:
Darksiders 3 (mere days before it arrived on Gamepass… dammit) - 60% off
Nintendo Switch:
Gorogoa (repeatedly and highly recommended by @Nightgaunt and @malkav11) - 50% off