Timed unlocks is a technique that allows you to unlock a puzzle after a certain amount of time has passed.

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1. Create an invisible puzzle.
   You can do this by going to the top bar --> "Puzzles" --> "Create new puzzle" --> Set the puzzle type to be "InvisiblePuzzle"
   
   
2. On the details page, set the "Minutes to automatically solve" to the number of minutes you want to delay your other puzzle by
   
3. Scroll down to prerequisites, and add the puzzles you want to unlock to the "I help to unlock this puzzles"
   
   You could have also gone to your puzzle and updated the "These puzzles help to unlock me:" instead.

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Your puzzle will have the invisible puzzle as a prerequisite, meaning that your puzzle cannot be unlocked for players until that invisible puzzle gets solved.
The invisible puzzle solves itself in 15 minutes, thereby unlocking your puzzle!