Well, first things first:
Yes, you can totally play this game offline.

This means yes to playing Prince of Persia: The Lost Crown at your gram-gram’s house with that fancy gaming laptop of yours, yes to playing while waiting for your ISP to plug that internet cable back in and double yes to playing on your Steam Deck while in a car, airplane or what have you.

Prepare for offline play
So, in order to play Prince of Persia: The Lost Crown offline on the device of your choice, you need to do the following:Launch the game at least once connected to the internet on the device you plan to play offline on and don’t close it until you’ve seen the in-game menu.
If you require guidance on how to enter your information on the Steam Deck, have a look at our First Launch Info article.

Recommendation
And to make your life easier with follow-up sessions be sure to- Tick the ‘Remember Me’ box when logging into your Ubisoft Connect Account and
- Link your Ubisoft Connect and Steam accounts.
Isn’t that something.
Helpful Resources
And just in case, here are some additional resources that can serve helpful:
- The on-Steam tech support forum
- Full FAQ of Prince of Persia: The Lost Crown
- Steam Deck – First Launch Info
- Information on Steam’s Offline Mode and how to use it
Your Prince of Persia Community Team