whom are immediately available to play as at the beginning of the game. The other four are referred to as "guest star" characters and have to be unlocked. Plot In the game, Cel Damage is a popular animated demolition derby series that airs weekly on the fictional network "'Toon T.V." The characters in Cel Damage are a select few of cartoon characters who battle every week to achieve fame and glory. The characters use their own vehicles and battle using a variety of deadly weapons. Because the characters in Cel Damage are cartoons, they cannot be killed and can continuously come back to fight again. Development The Cel Damage graphics engine uses a rendering technique called cel-shading to produce this cartoon-like appearance. Furthermore, the physics engine in Cel Damage is unique. Rather than aiming to simulate realistic real-world physics, it emulates complex cartoon physics; the physics engine calculates the relevant parts of physical interaction as they would in reality, and then distorts the physical laws to produce a cartoon-like interaction. This can be seen, for example, when a car turns and the entire shape of the car deforms and flexes into the turning direction. Cars and game objects can realistically be sliced into pieces, flattened, frozen, shattered, shredded, impaled, lit on fire (and subsequently burn to a crisp and fall into ashes), and more. Chris Hecker, editor of Game Developer magazine, described Cel Damage's cartoon-style graphics as "state-of-the-art for computer-game physics". Cel Damage was released as Cel Damage: Overdrive, a Europe-only title for the PlayStation 2. Play It released the game on 12 December 2002. Reception Cel Damage was generally praised for its cartoon graphics, but received "mixed or average reviews" on all platforms according to video game review aggregator Metacritic. Gerald Villoria of GameSpot called the Xbox version's visuals "impressive," and stated that the player "can easily think that [they are] playing a real-time cartoon". However, he added that some weapons in the game were far more useful than others, making the game a repetitive race to get the best weapon. Vincent Lopez of IGN said the cel shading in the same version "was one of the best examples of the effect on the market," but that the game play is too difficult due to both the computer players and the small arenas. Brian Davis of GameSpy praised the same version for its characters and maintaining its cartoon feel,