Although our game isn't specifically set up to play off line it is possible to do so, if you follow the instructions below (for instance on a flight).  

The trick is to open the game on your device when you take your seat on the plane and play one game through to the end (if you don't have time to play an entire game, just call MJ in error as soon as the game starts - after the Charleston). Once the game is open (and everything has loaded), you can then put your device into airplane mode and it will continue to work. You'll be able to play for as long as you wish (just don't close that tab). Though, be aware that none of the games will be recorded on your stats page.     

Keep in mind that different devices and browsers handle this differently so your results may vary.