Did you play treasure-hunt when you were kids? I did! And it was a favorite game. This dad over here made a treasure chest some 10 years ago for his children to play. And now it was about time to bring the chest into the 21st century. So, he hooked up some atmega and filled the chest with gizmos. To maintain the authentic look of the chest, he made a key recognition system with IR LEDs, to read the old-style keys when inserted in the keyhole. The chest delivers the clues by pushing out one of the decorative buttons, driven by a continuous rotating RC servo. The lock around the key pops out automatically to indicate that the chest is open. He also made a tone recognition system. The system recognizes 14 tones in a row played with Ocarina. If each tone is correct, the LED turn green and the next tone must be played, otherwise turn red and stop. Finally the video playback. He used the iTouch and the iHome Boombox for video and audio playback. The iTouch is fixed on the tray of an old DVD drive, and pops out to reveal more clues. See more photos in his website.