Writing and Erasing - Edible Sheet on Shabbat

Shalom and blessings. A. Is it permissible to eat an edible sheet on Shabbat that has an image or text printed on it, and is it similar to a biscuit or cake? B. Is it permissible to create letter shapes on Shabbat? C. Is it permissible to play Rummy on Shabbat? I would appreciate it if you could cite the sources. Thank you very much.

Shalom and blessings 

A. 

For Sephardim - it is permissible to cut and eat as usual. 

For Ashkenazim - this is not similar to a biscuit or cake that has letters engraved on it, or that is itself in the shape of a letter. Here, where the writing is on the cake, it is more severe. 

According to the law. If the cake was cut before Shabbat and the slices were separated, it is permissible to eat on Shabbat. 

If it was cut before Shabbat but the slices were not separated, an adult is forbidden to remove a slice, but it is permissible to ask a child to remove it for him. 

If each slice has a complete picture or letter, it is permissible to separate the slice and eat on Shabbat. [According to the Chazon Ish, the permission is only if the entire letter or picture is eaten at once]. 

B. Forbidden. 

C. Permissible. 

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