Crytek is offering a free trial version of Crysis Wars, the online multiplayer component of their well known and critically acclaimed Crysis series. It starts today, Thursday, April 9th and lasts until Friday, April 17th.
In order to participate, you need to register an account at the MyCrysis website. Once you have registered, at approximately 3 PM EST US, a message will appear in the MyCrysis News section, which will allow you to click a button entitled "Generate my Trial Key."
You can download the client in advance, which is suggested, as it is over 4GB in size. You will also need to download the latest 1.4 patch as well.
Although the online part of the trial ends on April 17th, you will be able to continue playing it completely for free on a LAN as long as you enabled the online activation during the trial period.