Shared crossword puzzle app.

Looking for a good one that my mother and I can both do together despite being in different cities. The scenario I hope for is we can both sign on to a specific puzzle and work on it privately, but that we can also both sign on and work on while over the phone. If one of us solves a word it would update both screens as we solve them. A good range of puzzles, form easy to hard would be a plus. What about one part of a news app like the daily?

Cheers.