Garry's Mod is a game made for creativity or the thousands of other creative game modes that are on this game but I highly reccomend this game.

PAYDAY 2 is a game about being apart of a group that are heisters, this game is an action paked first person shooter with an array of weapons and masks.

Fistful of Frags is a multiplayer first-person shooter set in the cowboy times, it is fun and addicting game to play that I play quite regularly.

Sven Co-op is a free to play game but is a seperate game from the Half-Life series it is a multiplayer game that involes puzzles and shooting head crabs

Emily is Away is a very stressful in a love kind of way as you try to find your way into the heart of your friend Emily it is a very exotic game but sad

I recommend Counter Strike Gobal Offensive (CS:GO) as is a very action paked game multiplayer first-person shooter that everyone would enjoy.