The Padlock

Spoiler: Explanation (NOT puzzle solution, but may be considered as hint)

1.There are 5 possible states of the key:
- Outside (starting position)
- Inside, teeth facing down
- Inside, teeth facing left
- Inside, teeth facing up
- Inside, teeth facing right

2.It is impossible to travel if the state of the key is incorrect.

3.There is(are) unused path(s).

Excellent puzzle and beautiful design. This level really shine.

Made it! Great puzzle.

Thankyou for your compliments

Yes, very beautiful design, but easy to solve

Awesome idea,yo!

This is awesome

And I really loved the question mark on the back!

Thanks guys XD

@Koustav much better than just plain metal :3 while I don't actually know why I put a question mark there, lol

Excellent conception and design! Thanks @FREED0M for this great full level.

Amazing

Amazing

Great one! Thanks.

Best Puzzle Ever And Great Design

Very cool design!