The GOG version is currenyly 75% off for $10 until tonight. If you don’t know, GOG is a non-drm storefront that encourages a “you own your games” philosophy. They’re an awesome alternative to Steam and often cheaper too.

I’ve also played the multiplayer mod, and its very fun and works really well. It does require setting up a server and client(s) so a bit of basic networking is involved, but nothing too crazy