Look at today's icon and guess which World of Warcraft Forever ability it belongs to. Type an ability, or a class name to see all of its abilities, and pick one from the list.
Every wrong guess is listed under the search box, so you can see what you have already tried.
Hard mode is on to start with: Black and white removes the icon's colours, and Random rotation turns it on its side or upside down. For an easier puzzle, turn either switch off under the game.
Every ability you find is added to your spellbook. A new icon comes every day at midnight UTC.