Crysis is a science fiction first-person shooter computer game developed by German company Crytek and published by Electronic Arts, and is the first game of a planned trilogy. It was released on November 13, 2007 in North America, November 15 in Australia, November 16 in Europe, November 23 in New Zealand, and November 29 in Japan. Initial NPD sales numbers were taken as a sign that the game had flopped. However, during EA's Q3 2008 Earnings Conference Call, it was stated that Crysis had sold over one million copies worldwide in the fiscal quarter and that the game continues to exceed sales expectations.

Crysis is based in a fictional future where an ancient alien spacecraft has been discovered deep within the Earth. The single player campaign has the player assume the role of United States Delta Force operator Jake Dunn, referred to in-game by his call sign, Nomad. Nomad is armed with various futuristic weapons and equipment, most notably a "Nano Muscle Suit" which, according to Crytek senior game designer Bernd Diemer, was inspired by the United States' Future Force Warrior 2020 program. In Crysis, the player fights both North Korean and extraterrestrial enemies, in four different locations: a tropical island jungle, inside an "Ice Sphere" (consisting of the same jungle, but frozen), the alien ship itself (with a zero-gravity area) and a U.S. Navy aircraft carrier. Crysis uses Microsoft's new API, Direct3D 10 (DirectX 10) for graphics rendering, and includes the same editor that was used by Crytek to create the game.

CRYSIS is an acronym for CRYogenic Stockholm Ion Source. CRYSIS is an ion source of EBIS type, and is located in Stockholm, Sweden.

The CRYSIS ion source is an electron beam that is compressed and confined by the magnetic field of the solenoid. CRYSIS uses a superconducting solenoid to produce the magnetic field necessary to achieve high electron beam densities. The cryostat is cooled to -269°C by liquid helium and provides the high-quality vacuum necessary to prevent the highly charged ions from recombining.

CRYSIS can produce highly intense electron beams with high current densities. By colliding with the atoms, the electron beam ionises the injected gas. When the desired charge state is reached, the ion beam goes through the beam line system to the storage ring or to another experiment.

This type of ion source is designed for the production of ions with very high charge states.