In this 3D puzzle game you need to pick a key from the box that perfectly matches the lock on the door. Drag the key with your mouse or finger towards the lock to check for color and size matching, which are randomly generated for each new door. There are one hundred unique doors to unlock, each with a fresh set of keys, leading up to the final victory. On a successful match, the door smoothly swings open and you advance to the next challenge with a renewed key selection. If the key does not fit, it returns to the box and you can try another one without losing your progress. The interface supports three languages Russian, English and Chinese, and keeps track of how many doors you have opened. The goal is to complete all one hundred levels and receive a congratulatory message for full completion.
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