Classic Mode—a back-to-basics mode that focuses on core combat and movement. There’s no in-match Store, Radar, Mysticals, or Sidekicks and Heavy Weapons will spawn around the map.
Naughty Dog's official description of Classic Mode

Classic Mode is a gamemode in A Thief's End multiplayer.
Overview[]
Beta[]
Classic mode was a new gamemode after the bounty hunter DLC. Beta first started on November 3, 2016 and finish on the 7th.[1]
It was re-added back into the multiplayer playlist on the 3rd February 2017 through the Patch 1.20 update.[2]
Description[]
Classic mode is based on Team deathmatch from Among Thieves multiplayer.
Difference from other Uncharted 4 gamemodes[]
- No In-match Store
- No in-game Radar
- No Mysticals
- No Sidekicks
- No purchasable Heavy Weapons (Heavy Weapons will be spawned randomly around the map instead)