Sudoku Puzzles For Kids 6x6 : 100 Sudoku Puzzles with Answer Key ... - Free Printable

Let’s solve this 6x6 Sudoku puzzle step by step.

In a 6x6 Sudoku:
- Each row must have the numbers 1 to 6, no repeats.
- Each column must have the numbers 1 to 6, no repeats.
- Each 2x3 box (there are 6 of them) must also have 1 to 6, no repeats.

We’ll fill in the blanks one at a time using logic.

Here’s the grid with positions labeled for clarity:

Row 1: [ _ , _ , 3 | _ , 1 , _ ]
Row 2: [ 5 , 6 , _ | 3 , 2 , _ ]
Row 3: [ _ , 5 , 4 | 2 , _ , 3 ]
Row 4: [ 2 , _ , 6 | 4 , 5 , _ ]
Row 5: [ _ , 1 , 2 | _ , 4 , 5 ]
Row 6: [ _ , 4 , _ | 1 , _ , _ ]

Let’s start filling in what we can.

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Step 1: Look at Row 2

Row 2: 5, 6, ?, 3, 2, ?

Missing numbers: 1 and 4.

Look at Column 3: already has 3, 4, 6, 2 → so missing 1 and 5. But Row 2 already has 5 and 6, so in Row 2, Column 3 cannot be 5 → must be 1? Wait, let’s check Box 1 (top-left 2x3 box).

Box 1 (Rows 1-2, Columns 1-3):

Row 1: ?, ?, 3
Row 2: 5, 6, ?

So far in Box 1: 3, 5, 6 → missing 1, 2, 4.

Column 3 in Box 1: Row 1 Col 3 = 3, Row 2 Col 3 = ? → can’t be 3 again.

Also, Row 2 already has 5,6,3,2 → so missing 1 and 4.

Now look at Column 6 in Row 2: what’s above/below?

Column 6: Row 1=?, Row 2=?, Row 3=3, Row 4=?, Row 5=5, Row 6=?

Not helpful yet.

Wait — let’s try Row 4.

Row 4: 2, ?, 6, 4, 5, ?

Missing: 1 and 3.

Look at Column 2: Row 1=?, Row 2=6, Row 3=5, Row 4=?, Row 5=1, Row 6=4 → so Column 2 has 6,5,1,4 → missing 2 and 3.

But Row 4 already has 2 → so Row 4, Column 2 cannot be 2 → must be 3? Then Row 4, Column 6 would be 1.

Check if that works.

Try: Row 4, Col 2 = 3 → then Row 4, Col 6 = 1.

Now check Box 4 (middle-right: Rows 3-4, Cols 4-6):

Row 3: 2, ?, 3
Row 4: 4, 5, 1 ← if we put 1 here

So Box 4: 2, ?, 3, 4, 5, 1 → missing 6 → so Row 3, Col 5 must be 6.

Yes! That fits.

So update:

Row 3: [ _ , 5 , 4 | 2 , 6 , 3 ]

Row 4: [ 2 , 3 , 6 | 4 , 5 , 1 ]

Good.

Now Row 3 is almost done: only first cell missing.

Row 3: ?, 5, 4, 2, 6, 3 → missing 1.

So Row 3, Col 1 = 1.

Update Row 3: [1, 5, 4, 2, 6, 3]

Now Box 1 (top-left): Rows 1-2, Cols 1-3

Row 1: ?, ?, 3
Row 2: 5, 6, ?
Row 3: 1, 5, 4 ← wait, Row 3 is not in Box 1! Box 1 is only Rows 1-2.

I made a mistake.

Boxes in 6x6 Sudoku are 2 rows x 3 columns.

So:

Box 1: Rows 1-2, Cols 1-3
Box 2: Rows 1-2, Cols 4-6
Box 3: Rows 3-4, Cols 1-3
Box 4: Rows 3-4, Cols 4-6
Box 5: Rows 5-6, Cols 1-3
Box 6: Rows 5-6, Cols 4-6

So Row 3 is in Boxes 3 and 4.

Back to Row 4: we set Col 2 = 3, Col 6 = 1 → seems okay.

Now Row 3: we have [?, 5, 4, 2, ?, 3] — earlier I thought Col 5 was 6, but let's verify.

In Box 4 (Rows 3-4, Cols 4-6):

Row 3: Col4=2, Col5=?, Col6=3
Row 4: Col4=4, Col5=5, Col6=1 (we just set)

So Box 4 has: 2, ?, 3, 4, 5, 1 → missing 6 → so Row 3, Col 5 must be 6. Yes.

So Row 3: [?, 5, 4, 2, 6, 3] → missing number is 1 → so Row 3, Col 1 = 1.

Even though Row 3 is not in Box 1, it’s fine — we’re just filling the row.

So Row 3: [1, 5, 4, 2, 6, 3]

Now Box 3 (Rows 3-4, Cols 1-3):

Row 3: 1, 5, 4
Row 4: 2, 3, 6 → perfect, all 1-6 present.

Good.

Now Row 2: [5, 6, ?, 3, 2, ?]

Missing: 1 and 4.

Look at Column 3: currently has Row1=3, Row2=?, Row3=4, Row4=6, Row5=2, Row6=?

So Column 3: 3, ?, 4, 6, 2, ? → missing 1 and 5.

But Row 2 already has 5 → so Row 2, Col 3 cannot be 5 → must be 1.

Then Row 2, Col 6 must be 4.

Check Column 6: Row1=?, Row2=4, Row3=3, Row4=1, Row5=5, Row6=? → so far 4,3,1,5 → missing 2 and 6. Okay.

So Row 2: [5, 6, 1, 3, 2, 4]

Now Box 1 (Rows 1-2, Cols 1-3):

Row 1: ?, ?, 3
Row 2: 5, 6, 1 → so far: 3,5,6,1 → missing 2 and 4.

Column 1: Row1=?, Row2=5, Row3=1, Row4=2, Row5=?, Row6=? → has 5,1,2 → missing 3,4,6.

Column 2: Row1=?, Row2=6, Row3=5, Row4=3, Row5=1, Row6=4 → has 6,5,3,1,4 → missing 2.

Oh! Column 2 is almost full: only Row 1, Col 2 missing → must be 2.

Because Column 2 has: 6,5,3,1,4 → yes, missing 2.

So Row 1, Col 2 = 2.

Then in Box 1, we have Row1: ?, 2, 3; Row2: 5,6,1 → so missing 4 → so Row1, Col1 must be 4.

Check Column 1: Row1=4, Row2=5, Row3=1, Row4=2 → good so far.

So Row 1: [4, 2, 3, ?, 1, ?]

Missing in Row 1: 5 and 6.

Now Box 2 (Rows 1-2, Cols 4-6):

Row 1: ?, 1, ?
Row 2: 3, 2, 4 → so far: 1,3,2,4 → missing 5 and 6.

Column 4: Row1=?, Row2=3, Row3=2, Row4=4, Row5=?, Row6=1 → has 3,2,4,1 → missing 5,6.

Column 6: Row1=?, Row2=4, Row3=3, Row4=1, Row5=5, Row6=? → has 4,3,1,5 → missing 2,6.

For Row 1, Col 4 and Col 6: need 5 and 6.

Look at Column 4: cannot have duplicate. Currently has 3,2,4,1 → so 5 and 6 are both possible.

But in Box 2, we need to place 5 and 6 in Row 1, Cols 4 and 6.

Now look at Row 5: [?, 1, 2, ?, 4, 5]

Missing: 3 and 6.

Column 1: Row1=4, Row2=5, Row3=1, Row4=2, Row5=?, Row6=? → has 4,5,1,2 → missing 3,6.

Column 4: Row1=?, Row2=3, Row3=2, Row4=4, Row5=?, Row6=1 → has 3,2,4,1 → missing 5,6.

For Row 5, Col 1 and Col 4: need 3 and 6.

If Row 5, Col 1 = 3, then Col 4 = 6.

Or vice versa.

Check Box 5 (Rows 5-6, Cols 1-3):

Row 5: ?, 1, 2
Row 6: ?, 4, ? → so far: 1,2,4 → missing 3,5,6.

Column 1: as above, missing 3,6.

Column 3: Row1=3, Row2=1, Row3=4, Row4=6, Row5=2, Row6=? → has 3,1,4,6,2 → missing 5.

So Row 6, Col 3 must be 5.

Because Column 3 only missing 5.

So Row 6, Col 3 = 5.

Now Row 6: [?, 4, 5, 1, ?, ?]

Missing: 2,3,6.

But Row 6 must have 1-6, already has 4,5,1 → missing 2,3,6.

Now Box 5: Rows 5-6, Cols 1-3

Row 5: ?, 1, 2
Row 6: ?, 4, 5 → so far: 1,2,4,5 → missing 3,6.

Column 1: missing 3,6 (as before).

So Row 5, Col 1 and Row 6, Col 1 must be 3 and 6.

Now back to Row 5: [?, 1, 2, ?, 4, 5] → missing 3,6 for the whole row.

Similarly, Row 6: [?, 4, 5, 1, ?, ?] → missing 2,3,6.

But in Box 5, we need to place 3 and 6 in Col 1 for Rows 5 and 6.

Suppose Row 5, Col 1 = 3 → then Row 6, Col 1 = 6.

Then Row 5: [3, 1, 2, ?, 4, 5] → so Col 4 must be 6.

Check Column 4: Row1=?, Row2=3, Row3=2, Row4=4, Row5=6, Row6=1 → has 3,2,4,6,1 → missing 5.

But Row 1, Col 4 needs to be 5 or 6 — if Row 5, Col 4 is 6, then Row 1, Col 4 must be 5.

Then Row 1, Col 6 must be 6.

Check Column 6: Row1=6, Row2=4, Row3=3, Row4=1, Row5=5, Row6=? → has 6,4,3,1,5 → missing 2.

So Row 6, Col 6 must be 2.

Then Row 6: [6, 4, 5, 1, ?, 2] → missing 3 → so Row 6, Col 5 = 3.

Now check Box 6 (Rows 5-6, Cols 4-6):

Row 5: 6, 4, 5
Row 6: 1, 3, 2 → perfect: 1,2,3,4,5,6.

Now Row 5: [3, 1, 2, 6, 4, 5] → good.

Row 6: [6, 4, 5, 1, 3, 2] → good.

Now back to Row 1: we had [4, 2, 3, ?, 1, ?] and we said Col 4=5, Col 6=6.

So Row 1: [4, 2, 3, 5, 1, 6]

Check Box 2: Row1: 5,1,6; Row2:3,2,4 → all 1-6, good.

Now let’s write the full grid:

Row 1: 4, 2, 3, 5, 1, 6
Row 2: 5, 6, 1, 3, 2, 4
Row 3: 1, 5, 4, 2, 6, 3
Row 4: 2, 3, 6, 4, 5, 1
Row 5: 3, 1, 2, 6, 4, 5
Row 6: 6, 4, 5, 1, 3, 2

Now verify each row, column, and box.

Rows: all have 1-6, no duplicates. Good.

Columns:

Col 1: 4,5,1,2,3,6 → good
Col 2: 2,6,5,3,1,4 → good
Col 3: 3,1,4,6,2,5 → good
Col 4: 5,3,2,4,6,1 → good
Col 5: 1,2,6,5,4,3 → good
Col 6: 6,4,3,1,5,2 → good

Boxes:

Box 1 (R1-2,C1-3): 4,2,3 / 5,6,1 → 1,2,3,4,5,6
Box 2 (R1-2,C4-6): 5,1,6 / 3,2,4 → good
Box 3 (R3-4,C1-3): 1,5,4 / 2,3,6 → good
Box 4 (R3-4,C4-6): 2,6,3 / 4,5,1 → good
Box 5 (R5-6,C1-3): 3,1,2 / 6,4,5 → good
Box 6 (R5-6,C4-6): 6,4,5 / 1,3,2 → good

Perfect!

Final Answer:
4 2 3 5 1 6
5 6 1 3 2 4
1 5 4 2 6 3
2 3 6 4 5 1
3 1 2 6 4 5
6 4 5 1 3 2