2.5 million copies sold in EA, but barely got a mention? ok…

Ok, not so much as hidden, but also not super known:
Shadow Tactics: Blades of the Shogun. A tactical stealth game (think commandos saga back in the day) is 90%
Technobabylon. A pixelated point & click adventure with some cyberpunk themes at 70%
Return of the Obra Dinn. Probably the best detective/deduction game that I’ve played, at 40%
Prey. One of the best immersive sims, at 75%
The Case of the Golden Idol. Is not as good as Obra Dinn in my opinion, but it’s super good none the less, at 30%
Antichamber. Super good puzzle game, at 75%
The Age of Decadence. Ultra hardcore RPG set in ancient Rome, 60%
Tametsi. Is like minesweeper but good, 67% (and only 0.77€)

Yeah, it’s also my favorite game of all time. But I’m conflicted about recommending it to a lot of people…

Well… you buy a license normally. The only online service that I know that give you a real copy of the game and it’s yours forever is gog, and they don’t sell too many modern games…