episode, one of which is a "low gravity" level that challenges the player's abilities in a different way). If the player's character dies, they must restart at the beginning of that level. The game may be saved at any time in the PC versions and between levels in the console versions. Upon completing an episode, the player is returned to the hub "START" level, where another episode can be chosen. Each episode starts the player from scratch, without any previously collected items. Episode one (which formed the shareware or downloadable demo version of Quake) has the most traditional ideology of a boss in the last level. The ultimate objective at the end of each episode is to recover a magic rune. After all of the runes are collected, the floor of the hub level opens up to reveal an entrance to the "END" level which contains a final puzzle. Multiplayer In multiplayer mode, players on several computers connect to a server (which may be a dedicated machine or on one of the player's computers), where they can either play the single-player campaign together in co-op (cooperative) mode, or play against each other in multiplayer. When players die in multiplayer mode, they can immediately respawn, but will lose any items that were collected. Similarly, items that have been picked up previously respawn after some time, and may be picked up again. The most popular multiplayer modes are all forms of deathmatch. Deathmatch modes typically consist of either free-for-all (no organization or teams involved), one-on-one duels, or organized teamplay with two or more players per team (or clan). Players frequently implement mods during teamplay. Monsters are not normally present in teamplay, as they serve no purpose other than to get in the way and reveal the positions of the players. The gameplay in Quake was considered unique for its time because of the different ways the player can maneuver through the game. Bunny hopping or strafe jumping allow faster movement, while rocket jumping enables the player to reach otherwise-inaccessible areas at the cost of some self-damage. The player can start and stop moving suddenly, jump unnaturally high, and change direction while moving through the air. Many of these non-realistic behaviors contribute to Quakes appeal. Multiplayer Quake was one of the first games singled out as a form of electronic sport. A notable participant was Dennis Fong, who won John Carmack's Ferrari 328