Crysis

Crysis is a game that gets very unfairly overshadowed by it's legacy of being a PC benchmark. Yes, Crysis was, and still is a super technically impressive achievement that manages to look absolutely gorgeous almost 20 years later (omg btw.... 20???? x_x) but underneath that you have an incredibly creative and open FPS with tons of replayability and a very high skill ceiling that allows you to do insane things, pushing every mechanic in the game to it's absolute limit. The open world island isn't just gorgeous, it allows for incredible levels of freedom in the way you approach the game and every combat encounter. Gameplay is buttery smooth and feels perfectly suited for any approach you want to take whether that is being stealthy or rushing in abusing every skill in your arsenal to look like a superhero. You can just have so much fun with Crysis that few singleplayer FPS really manage to capture in the same way. It's more akin to something like Metal Gear Solid V than like a Call of Duty in it's approach to gameplay. On top of that, the soundtrack is beautiful, perfectly complimented the absurdly detailed environment AND towards the end of the game a new enemy is introduced that is both amazing and almost H.R. Giger like in it's art design and also extremely fun and refreshing to play against. I really think Crysis is a highlight FPS that any fan of the genre should experience. Don't be afraid to tinker and see what is possible with the engine, you might be surprised how much depth the gameplay allows. Also, extreme modability is always a plus for a game and Crysis has that in spades. To this day, some of the most photorealistic like graphics are achieved on this engine through modding, let alone all the custom missions and maps you can experience. Crysis rules.