If you're into spooky games or just want something that'll challenge you, then Slender The Eight Pages is definitely worth checking out. It's not for the faint of heart, though - it can get pretty intense. But if you're up for a game that'll keep you on the edge of your seat, then you should totally give it a try.
Slender: The Eight Pages (2012) - MobyGames
The game's also pretty relaxing in a weird way. I mean, it's not like you're in a rush or anything. You can take your time, explore the woods, and just enjoy the atmosphere. It's like a cozy horror game, if that's even a thing.
Anyway, you should totally download it for Windows and give it a try. It's a blast, and I think you'll really enjoy it. Just don't say I didn't warn you...