One of my all-time favorite games to play on PC. It has building, crafting, exploring, fighting, progression, and is overall a VERY fun game. Even better, a multiplayer "server" can hosted directly through Steam, so there's no need for port-forwarding or hosting.

10/10, would spend another few thousand hours on :)

EXTRA: There are also plenty of wonderful mods for this game on the terraria forums. They so much more to the game, highly recommend you check them out as well!