Read the dictionary definition of puzzle. All definitions for this word.
1. a game that tests your ingenuity
2. a particularly baffling problem that is said to have a correct solution
1. he loved to solve chessmate puzzles
2. that's a real puzzler
3. be a mystery or bewildering to
1. This beats me!
2. Got me--I don't know the answer!
3. a vexing problem
4. This question really stuck me
4. be uncertain about; think about without fully understanding or being able to decide
1. We puzzled over her sudden departure
See also:
Merriam-Webster definition of puzzle