Puzzle
To see or do a jigsaw puzzle in your dream represents a mental challenge or problem that you need to solve in your waking life. If there are pieces missing in the puzzle, then it suggest that you do not have all the facts needed to make an informed decision.
To see or do a crossword puzzle in your dream suggests that you are being faced with a mental challenge. The dream may be a pun on "cross words" directed at you or aimed toward someone.
To see a puzzle lock in your dream implies that you need to carefully think about how to proceed with a situation before acting. You need to have patience and calmness or else you will risk isolating yourself.
To see or play with a slider puzzle in your dream points to your need for order in your life. You need things to be a certain way.