"Locked Lock" started with a simple idea concept of "Hmm... what if you had to open a lock, but it was locked shut by another smaller lock?"

With this concept as the foundation, I got to work incorporating some mechanisms I had been working on for awhile. Slowly it all came together, resulting in a very challenging sequential discovery puzzle.

Everyone counts steps differently so it's difficult to know the exact number, but I counted around 30 steps to reach the goal - keep in mind that some of these steps are straightforward while others may hold you back for a long time, so I exercise caution when using the amount of steps to rate a puzzle as good/bad or easy/hard.

This puzzle is very challenging.

Below is a solve video by Mr.Puzzle - please be warned that watching the video will spoil the solution for this puzzle!