One may think that there has to be a single answer to a puzzle, but there's no reason to insist on that. Crossword constructors occasionally make puzzles whose single right answer will be determined by an event that hadn't yet taken place when the puzzle was published; the outcome of ...
Create a game of clue where you give them a series of clues and once they guess the correct answer, the gift (unwrapped) is revealed from its hiding place. You can also apply this idea to their favorite game. If they love crosswords, create a crossword puzzle that spells their gift nam...