With this week's update, you can now unlock all the puzzles in a category with a one-time purchase, for example all 27 "Landmarks" puzzles for $7.99. Unlocking the puzzles enables voice chat and up to 2000 pieces. Puzzles (including custom puzzles) can still be unlocked individually, but instead of paying $0.99 each they now cost 'puzzle credits', which can be bought one at a time or in bundles for a discount.