GTA 5 mod allows multiplayer co-op in Story Mode

GTA 5's modding community is very active. It always provides players with fresh mods that enhance gameplay and allow them to experience the title in a whole new way.

Unmoddable – Multiplayer game mods for Singleplayer games

Steam Community :: Guide :: How to play CO-OP 2players mod

Multiplayer mod for Hitman World of Assassination (co-op & versus) - teaser : r/HiTMAN

GTA 5 AI mod taken down by Take-Two lawyers

GTA 5 Multiplayer Co-op Mod Showcase! Play LSPDFR & Other Mods w/ Friends & More!

Here's what Dead Rising 4's four-player co-op looks like

New Mod Allows Multiplayer Co-Op in GTA V

The GTA V Multiplayer reveal is here. : r/Games

Multiplayer mod for Hitman World of Assassination (co-op & versus) - teaser : r/HiTMAN