Binding of isaac is amazing, if you haven't played it yet you should.

Tetris 99 on the Nintendo Switch is super fun.

Mario Kart 8 deluxe is a blast, you haven't beaten anything until you get the secret unlocks.

Trouble in terrorist town (Garrys mod) very fun if you find the right server.

Sim city 2014 on Origin is an amazing city builder.

Path of exile is a solid 200 hour time sink.

Diablo 2 remastered was quite a lot of fun.

Rainbow Six Siege is great if you have 5 people to play with.

Natural-selection 1 was the best real time strategy game of all time.

Earthbound is one of the best rpgs of all time.