For all game modes, the basic objective is to kill enemy players. Upon spawning, the weapons menu is displayed and the player may pick from an arsenal of weapons. Frag grenades are also supplied by default and more can picked up from boxes laying around the maps ("Grenade Kit" or "Nade Kit" respectively). Jet boots are used to move around the maps, which typically consists of 2-3 levels/floors, or disorganized, floating boulders. Some servers enable temporary-lasting power-ups that grant multiplied damage (Berserker), invisibility (Predator mode), a flamethrower along with temporary invincibility (FlameGod), or Cluster Grenades (which temporarily replace regular grenades with three of more powerful, modified versions) or even a Bulletproof Vest (effectiveness of the vest depends on the distance from the firer of the bullet, and the vest slowly decreases as it soaks up damage, disappearing after absorbing a certain amount of damage, though there is no time limit). Health crates (known in the game as "Medikits") are available in many locations for healing injury back to 100% no matter how much a player is injured. Upon death and after waiting for a server-specified amount of time (on average 5 seconds), players re-spawn and may choose another weapon—this cycle repeats for the duration of the map, unless Survival Mode is enabled (in which case a spawning system similar to "Counter-Strike" is used). After a certain allotted time (on average 15 or 20 minutes), the map changes and scores are reset as players continue in another round. Players can chat with each other throughout matches (and to their own teams, for cooperative team-based game modes).