Maxvorstadt: "Weekly challenges"? Looks like the game needs to be always online, which is a big "Nope!" for me.
Can somebody tell, if one can play this game offline or if one has to be online to play the full game, without any content cut away? Right now, it sounds a bit Hitman-ish to me!
In Offworld Trading Company you need Galaxy to access and play Daily and Infinite Map challenge modes. In OTC there is also a piece of software called Tachyon.exe, Stardock Entertainment advanced stat-tracking software, being present, requesting access to the web. This, according to my friend who owns this game, can be denied at any time without consequence.
I expect that in Old World Single-Player-Online Challenges, daily, weekly or whatever this game will offer, as well as MP: Hotseat, Cloud Play, Asynchronous, Teams and what they call Comp Stomps, will also only be accessible via Galaxy. Or locked behind it for not better reason, depending how you are inclined to look at it.
You don't have to worry about pure Single-Player content. This will always be available without access to the Internet.