http://www.websudoku.com

Each Sudoku has a unique solution that can be reached logically without guessing. Enter digits from 1 to 9 into the blank spaces. Every row must contain one of each digit. So must every column, as must every 3x3 square.

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www.cryptograms.org

Play as many cryptograms as you want, absolutely free! If one's too difficult, just refresh the page to load another cryptogram.

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http://kids.niehs.nih.gov/home.htm

The NIEHS Kids' Pages are produced by the Office of Management, National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health, and the Department of Health and Human Services, as an informational and educational resource for all ages.