Twitter user Kya7y was going through her father’s old belongings, when she stumbled upon this amazing, hand-drawn maze he had made 30 years prior. The maze had taken him 7 years to complete, all while working as a school janitor.

The maze, titled Papa’s Maze, is currently being reproduced and sold for $40.

So far no one has been able to solve it.

[Via Viral Nova]