A grid must be filled with so no row or column repeats. Clues are some cells fixed to , or . What is the smallest number of clues so there is exactly one solution?
Select one option, then click Submit.
1
2
3
4
5
Select an option, then submit.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
AMC 2021 - Junior (2021)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →AMC 2021 - Junior (2021)