Rim (Mind Loft)

About Rim (Mind Loft)

Rim is the outside sudoku on Mind Loft, a free site of daily browser games. The 9x9 grid starts empty. Around its edges, in the gutters beside some rows and columns, sets of three digits are printed. Each set tells you which three digits sit in the first three squares of that line, reading in from that edge, but not in which order. Rows, columns and 3x3 boxes still hold 1 to 9 once each.

There is no arithmetic. A printed triple works like a naked triple handed to you: those three squares hold exactly those digits, so every other square in their box loses all three. Where two triples meet in one box, they name six of its nine digits, leaving the other three for the remaining squares. The gutters left blank are part of the puzzle too. Selecting a square lights up every gutter clue that speaks about it.

Each board has one solution reachable by logic. Wrong entries are not flagged, a clean solve scores 10, and the leaderboard is a race on the clock. On your first ever play there is one free hint that fills a correct number.

A new board goes up at midnight US Eastern Time. The number of printed triples falls through the week, from 30 of the 36 gutters on Monday to 16 on Saturday, and the Sunday Edition prints thirteen. Rim belongs to Mind Loft's sudoku family with Suds, Sando (sandwich), Frame and Diag.

How to play Rim (Mind Loft)

1. Open mindloftdaily.com/rim and press Start to show the day's empty grid and its edge clues.
2. Read each printed triple: those three digits fill the first three squares from that edge, in some order.
3. Remove those digits from the other squares of the same box, and use notes for candidates.
4. Fill every row, column and 3x3 box with 1 to 9 once each.
5. Finish without mistakes for a score of 10; your time sets your place on the leaderboard.

Screenshots

Tips

• Treat each triple as a naked triple and clear its digits from the rest of the box straight away.
• Where a row triple and a column triple meet in a corner box, look for the digit they share; it often sits in the corner square.
• Select a square to light up every gutter clue that affects it.
• Wrong entries are not flagged, so check boxes before you finish.

Questions