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What's Crysis?
So, what is Crysis? First, it's in no way related to Far Cry, and it's not a follow-up or spin-off of that game. Instead, it's an original alien invasion story set in the Spratly Islands, a small group of islands that actually exist in the real world and whose ownership is disputed by various nations, though the island in the game is far larger than any of its real-world counterparts, which are more reef than island.

-History and Information.
The story begins with a mysterious meteor falling to Earth from space and "landing" on an island. Since meteors typically burn up in the atmosphere or explode on impact, the nations of the world know that there's something extraordinary about this meteor. However, the North Korean military gets there first and declares the island off-limits to everyone else. Your character is part of a US Special Forces team that's deployed to the island to find out what's going on, and the first part of the game will have you battling the North Koreans. Things take a change for the worse in the second stage, however, when the alien object opens up, "flash freezes" the island, and messes with Earth's weather. With a global climate crisis building, enemies will unite to try and stop the alien menace. And that will lead to the third part of the game, which is being kept tightly under wraps for now, though we can tell you to brace yourself for some zero-gravity combat at this stage.

In an inkling of things to come, X-Isle featured a lush jungle island, though one populated by fearsome dinosaurs. Armed with this demo, the Yerli brothers took off for the 2000 Electronic Entertainment Expo having never been there before and with no idea what to expect. ("I guess we were the only people in the history of E3 who paid the entrance fee there," Cevat said.) Cevat barely knew any English back then, mostly cobbled together from American games and movies, and most of that consisting of swear words. Still, in a colorful way he managed to get someone at Nvidia to look at X-Isle, and Nvidia ended up using it as a tech demo for its newly introduced GeForce graphics cards. That led to a publishing deal to develop Far Cry, and the rest is history.
-Crysis requirements
MINIMUM
OS - Windows XP or Windows Vista
Processor - 2.8 GHz or faster (XP) or 3.2 GHz or faster* (Vista)
Memory - 1.0 GB RAM (XP) or 1.5 GB RAM (Vista)
Video Card -256 MB**
Hard Drive - 12GB
Sound Card - DirectX 9.0c compatible
MAX.
OS - Windows XP / Vista
Processor - Intel Core 2 DUO @ 2.2GHz or AMD Athlon 64 X2 4400+
Memory - 2.0 GB RAM
GPU - NVIDIA GeForce 8800 GTS/640 or similar

Demo available there!