One of the things that makes the gameplay so great are the dynamics. You have the ability to re-model the environment as well as customise your abilities and weaponry in real-time as you fight it out against koreans and aliens.

Every game claims to have "tactics", but compared to Crysis, they just don't. Below are descriptions of all the major gameplay elements in Crysis.


Gameplay Elements of Crysis

So, if aliens are attacking and you're not helping anyone, the situation is going to get worse and worse. But the great thing is, the game won't force you to do anything, you can do it all at your own pace or even skip certain missions. But you may suffer the consequences.

The next time you join a server, someone may have blown that tree up so now you will instantly have to change your tactics to adapt to the dynamic and ever changing environment.

The AI also needs to be smart enough to adapt to this very dynamic and ever changing environment. The natural disasters mentioned above will be as destructible as you'd expect, but there's also non-natural distasters in Crysis such as nuclear bombs which can literally flaten the surrounding environment on a scale never before seen in a video game.

If you want to take the fast and agile approach, you would set your suit to speed as an example, but as a consequence, you will not only lose power from your suit, but you will decrease your other attributes. So it's extremely important to adjust your suit perfectly to match your tactics and the situation. The different suit functions are speed, strength, armor and cloak. I think you can work out for yourself what each function does.

Crysis has what the CEO of Crytek likes to call a multi-threaded storyline. This means every major character has a storyline of their own, this includes your squad mates. If you let a squad mate die for example (mentioned above), it may make your future missions a little tougher, or you may have to find an alternative to a certain task.

Another thing about the story is this. There are no cut scenes, nor is there anyone telling you what to do (not directly or constantly anyway).

The story will unfold around you, its your job to find out what's going on. You need to keep your eyes open and ears tuned. A squad mate may mention to another squad mate that there is a weak spot to destroying one of the alien crafts. If you don't hear what that is, your going to have to kill it the hard way. That's just one, there will be things like that the whole way through Crysis.

Conclusion
In conclusion, Crysis will be a huge leap ahead in terms of gameplay. It will keep the proven-to-be-fun fps formula and add a whole new level to it.

 It will be the most unique gaming experience you will have had in a long time - if not of all time. This will set the standard for pc and console games in the years to come.