About Ring Tower
Ring Tower is the Tower of Hanoi, a famous puzzle from 1883. A tower of rings sits on the first peg, biggest at the bottom. Move the whole tower to the green peg, one ring at a time, and never put a bigger ring on top of a smaller one.
There are 12 towers, from 3 rings up to 9. Some have three pegs and some have four, and the extra peg makes it possible to finish in far fewer moves if you use it cleverly. Each tower shows its best number of moves, and matching it wins 3 stars.
The puzzle hides a beautiful idea: to move a tower of 5, first move a tower of 4 out of the way, then the big ring, then the tower of 4 back on top. With three pegs the best number of moves doubles and adds one with every ring: 7, 15, 31, 63. A robot checked every best number with a full search.
Best for ages 6+
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