![Micro Sudoku Puzzle](/sudoku/images/micro.gif) Micro (4x4) Sudoku
![Mini Sudoku Puzzle](/sudoku/images/mini.gif) Mini (6x6) Sudoku
![Icon for Sudoku+9 Sample #10](/puzzles/sudoku/plus9/samples/puzzle10icon.png) "+9" Samples
![Icon for birthday puzzle](/puzzles/sudoku/special/birthday1_icon.png) Special Occasions
Standard (9x9) Sudoku
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Sample Puzzles
About DC Sudoku
How to Sudoku
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Steps 16 to 21
Step 16 (basic) |
![puzzle strategy for step 16](step16strategy.gif) |
![arrow to the right](arrow.gif) |
![result for step 16](step16.gif) |
Step 17 (basic) |
![puzzle strategy for step 17](step17strategy.gif) |
![arrow to the right](arrow.gif) |
![result for step 17](step17.gif) |
Step 18 (basic) |
![puzzle strategy for step 18](step18strategy.gif) |
![arrow to the right](arrow.gif) |
![result for step 18](step18.gif) |
Step 19 (basic) |
![puzzle strategy for step 19](step19strategy.gif) |
![arrow to the right](arrow.gif) |
![result for step 19](step19.gif) |
Step 20 (basic) |
![puzzle strategy for step 20](step20strategy.gif) |
![arrow to the right](arrow.gif) |
![result for step 20](step20.gif) |
Step 21 (basic) |
![puzzle strategy for step 21](step21strategy.gif) |
![arrow to the right](arrow.gif) |
![result for step 21](step21.gif) |
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