Based on a Naaleh.com shiur by Rabbi Shimon Isaacson
·Can you play Scrabble on Shabbat? The Chayei Adam’s view is that any game that requires keeping score and would normally involve writing should not be played on Shabbat. The standard Scrabble games which is simply bringing together and distancing letters without affixing them to a permanent surface do not pose a problem with Kotev. However the deluxe editions, where the pieces are affixed to a groove, constitute writing according to Rav Moshe. He also ruled that the game was muktzah.
·Developing X-Ray films creates an image and is prohibited on Shabbat.
·Can you open and close a book that has writing on the side? The Rema rules leniently and permits it. He explains that one is not actually writing or erasing, one is simply bringing together and separating letters. Others add that it is similar to opening and closing a door or window in that it is part of the functionality of the book. However the Levush disagrees and argues that it may be a d’orayta prohibition. The Chazon Ish also rules stringently. Therefore one should avoid doing this if possible. If there is no alternative, one can follow the accepted lenient view held by the Mishne Berura. Random designs on the side of a book do not pose a problem.