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€)
Yes they have. I think that it’s not a law from the european union but a directive that then each country has to apply locally, but just with a simple search I found things like these:
https://variety.com/2022/digital/global/netflix-30-europe-content-quota-avms-1235286587/
https://looperinsights.com/what-do-new-european-content-laws-mean-for-streaming-services/
https://www.businessinsider.com/netflix-amazon-prime-video-eu-law-local-content-2018-9
The same devs have also desperados 3, and it’s also super good (it’s on gamepass also if I recall correctly). It’s at 50% now: Desperados III