Anagrams of: PUZZLEOVER

• a particularly baffling problem that is said to have a correct solution

• a game that tests your ingenuity

• be a mystery or bewildering to

• be uncertain about; think about without fully understanding or being able to decide

• President.

• a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States

• common black European thrush

• of or relating to the null set (a set with no members)

• a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

• a mathematical element that when added to another number yields the same number

• the point on a scale from which positive or negative numerical quantities can be measured

• the sight setting that will cause a projectile to hit the center of the target with no wind blowing

• indicating the absence of any or all units under consideration

• having no measurable or otherwise determinable value

• indicating an initial point or origin

• adjust (an instrument or device) to zero value

• adjust (as by firing under test conditions) the zero of (a gun)

• the 26th letter of the Roman alphabet

• any of numerous chiefly shorebirds of relatively compact build having straight bills and large pointed wings; closely related to the sandpipers

• an advertisement consisting of short scenes from a motion picture that will appear in the near future