Bookworm.
Link letters together to make words. Longer words are worth more points.

Friv.com.
Hundreds of free games to play online.

Games from AARP.
Includes daily crossword puzzles, jigsaw puzzles, brain teasers, word puzzles, solitaire, and more.

h.i.p. Pocket Change.
Educational games from the U.S. Mint.

JavaScripter Games.
Includes Tetris, Mindsweeper, Snakes, and more.

Miniclip.
Free games and shows.

Pegs.
Click and move pegs until only one peg remains.

Puzzlefast.
Creates printable word puzzles like word searches and crosswords using words you select.

Sudoku.
Simple number placing game. "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."

Thinks.com.
Free online puzzles and games including Sudoku, crossword puzzles, jigsaw puzzles, chess, checkers and even Chinese checkers.

UGO Games.
This site offers a variety of fun and educational flash games with everything from action games to Sudoku.

Unlimited Web Games.
Over 800 free online games.

Yahoo Games.
Includes some free 5-minute daily games.