A trilogy of mechanical puzzle boxes, each containing a key to the final lock.

Each puzzle in the series is a complete challenge in its own right. unique mechanisms, escalating difficulty, and a story that begins the moment you pick one up.

Whether you start with ECD 001, 002, 003 or take on the full set, you’ll be immersed in layers of discovery, persistence, and secrets that keep you asking, what comes next?

The hidden keys unite to open the Final Lock, a fourth box waiting as the culmination of the trilogy. It is the climax of the set, the moment where everything ties together and the story completes itself through your hands.

This is not just a puzzle collection, but a progression. Together they form an experience engineered to leave you satisfied, challenged, and compelled to share it with someone else.