The CS Grenade was originally to be included in both Gearbox's version of Counter-Strike: Condition Zero and in the planned patch for Counter-Strike. As Gearbox Software failed to meet to deadline for their game, the project was scrapped along with the grenade. Only two HUD and a kill icon remain in the game files.
The idea was later reconsidered when Ritual Entertainment acquired Gearbox's assets for their version of the game but was ultimately cut. HUD icons remain in the game files along with a viewmodel and worldmodel and several mentions within the DLL files.