Doom's single player was described as having "badass demons, big effing guns, and moving really fast" as key principles, according to id Software executive producer Marty Stratton.[7] The game will feature a large arsenal of weapons, which can be collected and freely switched by players throughout the game. Weapons such as the super shotgun and BFG 9000 will return. Additionally, melee weapons such as the chainsaw, which can cut enemies in half, are also featured. Many enemies from the original games like the Revenant, Mancubus, and Cyberdemon return as well, some redesigned.[8] As the combat system of the game puts emphasis on momentum and speed, the game allows players to perform movements like sprinting and double-jumping. A combat system known as "push forward combat" is featured, which discourages players from taking cover behind obstacles or resting to regain health also known as a health-regeneration system. Players instead collect health and armour pick-ups scattered throughout levels, or kill enemies to regain health. A new mechanic introduced in Doom is the melee execution system. It allows players to perform a melee-take-down similar to that of a popular PWAD Brutal Doom when players deal enough damage to enemies. Enemies available for melee-take-down will be highlighted.[9] id Software states that Doom's campaign will be more than 13 hours long and the "Ultra-Nightmare" difficulty level will have permadeath. Multiplayer. The game's multiplayer is being developed in conjunction with Certain Affinity.[12] Several multiplayer modes, such as traditional four-player deathmatch, Domination, Warpath, Freeze Tag, and Clan Arena are included in the game.[13] Players can also use power-ups and teleporters in a multiplayer match. Players can pick-up a pentagram, one of the powerups featured, to transform into and fight as one of the demons featured in the game. The game will also include a built-in tool titled "Doom SnapMap" which allows players to construct custom maps, create new game modes and share them with the online community.[14] At launch, the game features 9 maps.