Ecks vs. Sever

At the beginning of the game, players choose which character, Ecks or Sever, they wish to control. Both characters' plots intertwine and are given different level designs for each of their missions, amounting to eleven per character, with occasional boss battles against the other character. A password system is used to maintain player progress, with each level's password starting with the same first letter as the name of the character it is associated with. The gameplay is similar to other early FPS titles such as Doom, in that all of the graphics for enemies and weapons are 2D sprites in a 3D setting, and the controls utilize the D-pad for tank-like movement and shoulder buttons for strafing.

Ecks vs. Sever was developed by Crawfish Interactive, which obtained the license to create the game based on an early rendition of a script for Ballistic: Ecks vs. Sever, an upcoming action film which had not yet entered production. The close relationship between game publisher BAM!

Entertainment and Franchise Pictures allowed for the option to develop games based on any of the film company's received scripts. Video game producer Tim Mawson explained that the decision to release the game prior to the film was based on the confidence by Bam! and Crawfish that Ecks vs. Sever was "a good enough game to stand on its own two feet".

While the film is considered one of the worst ever made, the game Ecks vs. Sever received positive reviews, garnering an aggregate score of 80 out of 100 on Metacritic. IGN gave the game an "outstanding" 9.0/10 and an Editor's Choice award, calling it "the best GBA first person shooter to date" and "one of the best four player games made yet for the Game Boy Advance."