An ordinary sudoku, plus a number outside every row and column end: the total of the first three squares reading in from that edge. Rows, columns and boxes still hold 1 to 9 exactly once.
About Frame
Frame is a free daily frame sudoku from Mind Loft. Each day gives you a 9×9 grid with a number printed outside every row and column end: the sum of the three squares nearest that edge, reading inward. Thirty-six sums, all printed, every day, and rows, columns and 3×3 boxes still hold 1 through 9 exactly once. The sums do so much of the work that the board prints far fewer digits than an ordinary sudoku needs.
The reasoning is arithmetic on a fixed group of three: a 6 is 1, 2 and 3 in some order, a 24 is 7, 8 and 9, and the middle values are where the deduction lives. Select a square and the two sums that speak about it light up. Every board has a single solution you can always reach by logic, with no guessing, and on every board the gutter is load-bearing rather than decorative: the printed digits alone would fit more than one grid. Wrong entries are never flagged, so spotting your own slips is part of the puzzle, and a clean solve scores a perfect 10 with the daily leaderboard decided on the clock.
A new board drops every day at midnight Eastern; weekdays print fewer digits as the week goes on, from 14 on Monday down to 4 on Saturday, and the Sunday Edition prints two. No app, no signup, play free in your browser. Want the rest of the family? Try Suds, the classic 9×9, Sando, the sandwich sudoku, Rim, the outside sudoku with nothing printed inside, and Diag, the one with the diagonals.
Frame, in short
How do you play Frame?
An ordinary sudoku plus a number outside every row and column end: the total of the first three squares reading in from that edge. Thirty-six sums, every one printed, and far fewer digits inside the grid than a sudoku usually needs.
Is Frame free to play?
Yes. Frame is free to play in your browser on Mind Loft, with no app to install and no account required.
When does a new Frame puzzle come out?
A new Frame arrives every day at midnight Eastern time, and Sundays bring the Sunday Edition, the biggest or hardest board of the week.
What kind of puzzle is Frame?
Frame is a daily sudoku from Mind Loft: the daily frame sudoku. It is part of the daily sudoku lineup.
Can I play past Frame puzzles?
Yes. Every past Frame board is in the puzzle archive, a tap away by day.
What other daily sudoku does Mind Loft have?
Rim, Polka, Whittle and Suds, among others. The Sudoku page lists every one, with a new board for each every day.