Slayer

Slayer is a popular and common gametype in the Halo video game series, and a staple of all Halo first person shooters. The object of the game is simply to kill as many opposing players as possible. Slayer is an extremely versatile gamemode, and can be played with a player count as low as 2 and as high as the maximum of 16 or 24 players (depending on the maximum number of players that the game allows for).

Infinity and Legendary Slayer
A Halo 4 Slayer variation, with several notable mechanics changes. Players spawn with customised loadouts (including tactical packages and support upgrades), and are able to call in ordnance. Due to the changes imposed by this mode, Halo 4 later introduced Legendary Slayer, a mode more resembling the Slayer gameplay of prior titles - with preset loadouts and no Ordnance.

Fiesta Slayer
Fiesta Slayer is a Slayer variant where all players spawn with random primary and secondary weapons, which range everything from basic loadout weapons to power weapons. In Halo 3, Fiesta Slayer was used in the Cinco de Mayo Double EXP weekend hopper, and was an FFA mode. Halo 4 features team-based Fiesta modes in Team Action Sack. Fiesta Slayer was added to Halo 5: Guardians in the Hammer Storm update. Super Fiesta is a gamemode in Halo 5: Guardians that features all the power weapon REQs that were previously exclusive to Warzone and campaign.

Team SWAT
SWAT is a small-team mode designed around fast-paced and tactical gunplay. Players spawn with headshot-capable weapons such as the DMR, battle rifle, Covenant carbine, LightRifle and Pistol, with no additional weapons spawning on the map. Players have no energy shields, and are thus susceptible to being killed in only one headshot.

Team Snipers and Shotty Snipers
Team Snipers is another Slayer variant designed around getting headshots. This time, players spawn with only a Sniper Rifle. Due to the Sniper Rifle ' s long range and high damage output, players will find taking advantage of power positions on the map while hiding in the shadows is key to success. Very skilled players may opt for running around the map killing opponents with no-scopes instead.

Shotty Snipers is a variant of Team Snipers. Here, the player spawns in with a Sniper Rifle as well as a shotgun—or, exclusive to Halo Infinite, a Bulldog.

Bro Slayer
Bro Slayer is a Slayer variant that makes use of Invasion-style respawns. The Big Team Battle version of this gamemode is called Big Bro Slayer. Both modes are exclusive to Halo: Reach.

Mini Slayer
Mini Slayer is a Slayer variant that makes everyone very small. To compensate for the reduced size, players move very fast. This mode was introduced in Halo 4 in the Action Sack playlist and returns in Halo Infinite in the Social Slayer playlist.