Jigsaw Puzzles
Daily Jigsaw Puzzles
A collection of free puzzles
JigZone
Free puzzles with a variety of piece numbers and shapes to choose from
"Paper" Puzzles
CALI Legal-Themed Crossword Puzzles
If you like your crosswords with a little bit of studying on the side
Daily Crossword Puzzles
Choose from several puzzles each day
New York Times Games
Featuring Spelling Bee, the daily Mini Crossword, Tiles, and more -- everything except the full crossword
Sudoku
A few other games are also available at this site
Other Games
The Oregon Trail 
The real deal (1990 version), from the Internet Archive.