These remind me of Dr. Nim, the unbeatable single-player board game from the 60s, which also used marbles to do binary math: https://www.youtube.com/watch?v=9K

These remind me of Dr. Nim, the unbeatable single-player board game from the 60s, which also used marbles to do binary math: https://www.youtube.com/watch?v=9KABcmczPdg https://www.youtube.com/watch?v=9KABcmczPdg