Ricochet is a multiplayer mod which was developed by Valve Software and originally released on November 1, 2000. The 1.1.1.0 patch of the game was later released on June 12, 2002. It is an official mod, and is available through Steam for purchase; however, it is free for those who purchased the retail version of Half-Life prior to the release of Steam. The game is now released on Steam for about $5. Ricochet is a deathmatch game notable for its apparent simplicity, inspired by arcade games and platform games in both concept and design. Three maps come with the mod, two for deathmatch and one for duel combat. One of its main sources of inspiration is the film Tron in which a similar game is played. Players jump between neon-lit platforms suspended above an abyss, and shoot disks at one another, trying to push the opponent off the platform and into the depths. There are also horizontal barriers which the disks can bounce off (hence the name Ricochet); a direct hit resulting in a fall scores 1 point, a single-bounced hit scores 2 points, double-bounced 3 points, and so on. Ricochet also features a second attack (done by the alternate fire key) which cuts off the head of your opponent. The decapitation attack (as it is called) uses all three of your discs, but recharges all of them at once quickly. There are four kinds of temporary bonuses to pick up: "power shot", "freeze shot", "fast shot", and "triple shot".