快猫短视频

#225 Dominoku

Set by Zoe Mensch

Over the past decade, the puzzling community has enjoyed inventing new puzzle names by adding the suffix 鈥渙ku鈥� to the end of various words.

To create this puzzle, a 鈥渄ominoku鈥�, I have taken a full set of 28 dominoes (in which the numbers run from 0 to 6, and each number is paired exactly once with every other number, including itself). I mixed the dominoes up and set them out on a 7 脳 8 rectangle on a table. Then I turned three over and copied the other numbers onto a grid. Your challenge is to identify which dominoes I hid and to mark the boundaries between all the dominoes.

Solution next week

#224 Russian dolls

Solution

To find my ring, I should open the largest yellow doll.

Starting with the largest blue doll, there must be a yellow one immediately inside it. Pink can鈥檛 contain red, and green can鈥檛 contain pink, so the order must be blue, yellow, red, pink, green.

Next, consider the largest yellow doll. Again, red must contain pink, which contains green. We have already used the smallest green, so the order must be yellow, red, pink, green, with the smallest doll being blue. Therefore, the ring is inside the largest yellow doll.