Daily Mini Killer (SudokuWiki)

SudokuWiki.org, Andrew Stuart's sudoku strategy site, runs a family of numbered daily puzzles, and the Mini Killer is the quickest of its killers. The grid is 6x6, split into 2x3 boxes, so each row, column and box takes the digits 1 to 6. On top of that the grid is divided into coloured cages, each with a small sum in its corner: the digits in a cage must add up to that sum and may not repeat inside it. Few or no digits are given at the start.

Each puzzle has a number, a date and a grade, and the grades cycle from Gentle to Diabolical: #812 on 21 October 2026 was Diabolical. The free page gives the day's grade; All-Access Supporters can play all four. The player has a 1 to 6 number pad, notes with options to prefill or auto-clear them, undo and redo, a check button, a restart, a timer with pause, keyboard controls and black-and-white or colour print versions. Below the board a calendar keeps the last 30 days of puzzles, with a solutions panel beside it.

The small grid makes it a good way into killer sudoku: the cage arithmetic is the same as on a full 9x9 killer, but a puzzle takes minutes rather than an hour. The page links to SudokuWiki's own guides on cage combinations, innies and outies and cage splitting.

The page says each new puzzle comes at midnight GMT, yet the previous day's grid stays up until about 03:00 UTC, so players in Europe and the Americas can still be on yesterday's number after their own midnight.

It suits sudoku players who want a short daily killer, and newcomers learning cage sums before moving to the site's full Daily Killer. The page is laid out for a desktop; on a phone it is the same page shrunk, so the cells are small without zooming.