Taxes also had to be paid in coins. The hole in the center, which now is cut in only the 5- and 50-yen coins, has several purposes.

For decades, arcades have been built around a single coin experience, either the 50 yen ($.44) coin or the 100 yen ($.88) one.

The hole in the center, now cut in only the 5- and 50-yen coins, has several purposes. As you surmised, you can carry the coins on a string and wear them, which makes them easier to protect from ...