Six sided special plate covering to prevent accessory recognition.
Factory's invented technology, sound doesn't leak out.
(But a mic and speaker are included so it can talk to the game master)When the frontal panel is slided up, the top panel can be moved.
The top can be removed to take out and insert a yukkuri, or pressed down to crush whatever that's inside.The boxes used in the gameOnly the front panel can be moved and accessory can be recognized.
(But there's a transparent panel so it's not possible to exit)