The goal is to fit five pieces into a rather unique box. The opening to the box is a sliding panel with a notch, and a block fixed on the inside. The movement of this panel creates a changing state which significantly complicates the solving process. With no external tools allowed or required, you'll have to summon all your creativity to defeat this clever opponent!
Payment through Paypal. Shipping cost will be calculated at the end of the auction as I am shipping from Sweden.
Happy bidding!