SA simple rock-paper-scissors (Janken in Japanese) AI that works without electricity.
Players can compete directly against this device in a game of Janken.
The device records the player’s previous moves and selects the hand with the highest probability of winning.
You can try to defeat it, see if it can learn a fixed pattern, or simply watch the rolling ball inside the mechanism. Observe how the device adapts to the player’s tendencies.

If you play in a repeating cycle of rock, scissors, paper, what hand do you think the device will choose?