Read today's tooltip, exactly as it appears in World of Warcraft Forever, and guess which ability it belongs to. Type an ability, or a class name to see all of its abilities, and pick one from the list.
Where the tooltip mentions the ability by its own name, the name is hidden as ?????. The numbers are those of the ability's highest rank.
Every wrong guess is listed under the search box, so you can see what you have already tried.
Every ability you find is added to your spellbook. A new tooltip comes every day at midnight UTC.