The 4x4 grid is the smallest version of the same rule that runs the full 9x9 puzzle, and that makes it the easiest place to start a class. There are only four digits to track, four small boxes to watch, and most children solve one puzzle in about five minutes.
This set has 24 puzzles, six to a sheet, with a Name and Date line and the answer key at the back.
Starter Sudoku 4x4: classroom set
24 puzzles for kindergarten to grade 2. Digits 1 to 4, one per row, column and box.
Free to print and share for classroom, library and care-home use. Read the one-paragraph licence.
How to introduce a 4x4 grid
Say the rule out loud in one sentence before handing out the sheet: each row, each column and each small square has 1, 2, 3 and 4 once. Do the first puzzle together on the board, thinking out loud about which digit is missing from a row before writing it in.
With six puzzles per sheet, one sheet covers a full lesson without needing a second page, which keeps prep simple on a busy week.
Common first mistakes
Three come up again and again in a first session. A child checks only the row and forgets the small square, so the same digit ends up twice in one box. A child rewrites a digit that was already given, thinking it is their own answer, which can make the grid look wrong when it is not. And a child guesses rather than working out which digit is forced, then gets stuck when the guess is wrong two cells later. Pointing these out once, on the board, heads off most of them.
After the set
Once 4x4 feels easy and quick, move up to the 6x6 junior set, which keeps the same rule but introduces boxes that are wider than they are tall.
Frequently asked questions
Kindergarten through grade 2, roughly ages 4 to 7, though any first-time solver can start here regardless of age.
Twenty-four, printed six to a sheet, with the answer key at the back of the PDF.
Yes, every sheet in this set is worksheet ready straight out of the printer.
The 6x6 junior set is the next step, using the same core rule on a slightly larger grid with rectangular boxes.