Do I need an internet connection to play?

[Pellaken]

I know I'll need the internet to download the game, but do I need a constantly active net connection to play?

 

[Jazzoid]

Nope, you can simly switch Steam to offline mode and then you don't need the Internet at all. Off course, if you won't want to play multiplayer .

 

[tal13s1n]

when you are online on steam, hit the "go offline" option under Steam and you can start steam in offline modus.