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Try my Interactive Sudoku, an online version of these puzzles that works on your browser or iPad. Krazydad Sudokus are also available in a daily puzzle (for print or online). Here's a blank sudoku grid in case you need to start over.
Killer Sudoku (also called Sum Sudoku) are a kind of hybrid puzzle that combine the best features of Sudoku and Kakuro (cross-sum) puzzles. Like a regular Sudoku, the rows, columns and 3x3 blocks contain the digits 1 thru 9.
Play these versions of my most popular puzzles. Best on a tablet or desktop. Smaller puzzles also work on phones. Save some trees!
Play Puzzles by Krazydad. Thousands of free sudoku and other logic puzzles. Solve on your desktop, tablet or phone.
Tough Sudoku Puzzles, Volume 1. Each of my books contains a collection of eight sudoku puzzles, 1-per-page, with a page of hints and a page of answers in the back. These booklets are in PDF format and need the Adobe Acrobat Reader to view or print.
Samurai Sudoku are a variant of Regular Sudoku puzzles, that feature conjoined grids, leading to a longer and more satisfying solving experience. My Samurai Sudoku puzzles are available in 2 different layouts (Twin, and 5-way). Each volume contains 100 printable booklets.
Here's a short tutorial to help you get started on these puzzles. My Jigsaw Sudoku puzzles are collected in 100 printable booklets per volume. Within each volume, the puzzles are also ordered by ascending difficulty. Each booklet contains eight puzzles, hints, and answers.
Each booklet contains a collection of eight different puzzles, 1-per-page, with a page of answers in the back. The booklets are ordered by ascending difficulty -- the puzzles in book 100 are much harder than the puzzles in book 1. All these puzzles have a single unique solution.
My Hexadecimal Sudoku puzzles are collected in 100 printable booklets per volume. Within each volume, the puzzles are also ordered by ascending difficulty. Each booklet contains eight puzzles, instructions, hints, and answers. Puzzles are available in both hexadecimal (0-F) and decimal (1-16) notation.
Each booklet contains a collection of eight different puzzles, 1-per-page, with a page of answers in the back. The booklets are ordered by ascending difficulty -- the puzzles in book 100 are much harder than the puzzles in book 1. All these puzzles have a single unique solution.