Counter Strike (all versions): the perfect shooter.
Terraria: the progression is amazing, but what never ceases to amaze me is how, despite the game’s huge content, it is never overwhelming or intimidating. Just a lot of fun.
Transport Fever 2: by far my favorite world-builder type game, and it still gets updates!
Discreetly insulting both Australia and Pluto in one sentence! Absolutely love this; will share it with all my Australia and Plutonian friends! If Earth gets attacked, it’s not my fault, but yours :'P