Gamers were able to download and play Crysis Wars free-of-charge from December 19 to December 28, 2008. To access the free trial, players needed to register at the official Crysis website to receive an access code and download the game client.

An additional free trial week begins on Thursday, April 9, 2009. Full details are provided on the official site.Crysis Official Modding Portal: Crysis Spring Free Trial (April 3, 2009) Those with access keys from prior trial periods will be able to reuse them.Eurogamer: Crysis Wars free trial starts Thursday (April 6, 2009)

Crysis Wars is the multiplayer mode for Crysis Warhead, a first-person shooter for Windows PC. Crysis Wars features three multiplayer and 21 different game maps.Destructoid: Celebrate the holidays with Crysis Wars free trial (December 18, 2008)

In Crysis multiplayer, up to 32 players compete in multiple modes across a variety of maps. Instant Action is a typical deathmatch mode in which 32 players try to eliminate everybody else and the last man standing wins. Power Struggle pits two teams, both equipped with nanosuits, against each other. The goal is to destroy the other team's headquarters. Players begin with only a gun and basic armor. Upgrades can be purchased with cash earned by killing enemies or completing objectives. Crysis Wars added one new mode, a team-based version of Instant Action.