Mario Kart: Wii, Wii U or Switch
A fun game for everyone to play together, until it gets competitive and someone threatens to move out when you hit them with a Blue-Shell
Left4Dead 2: Xbox 360 or PC
Zombie survival game where up to 4 players try to survive hoards and hoards of zombies! Perfect for Halloween!
Gears of War 4: Xbox One
A fantastic first-person shooter where the campaign can be entirely played co-operatively. I’ve actually played it as a co-op and it is a hugely difficult but rewarding experience!
Super Smash Bros:
In terms of fighting games, the artistic style of Smash Bros mixed with the complex attack system gives the game a hugely approachable yet competitive style.