100 different Sudoku puzzles in five degrees of difficulty - easy to print out.
License: Freeware
OS Support:

Solve crosswords, anagrams, word-based puzzles, nonograms and sudokus
License: Shareware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP,Windows2003,Windows Vista Starter,Windows Vista Home Basic,Windows Vista Home Premium,Windows Vista Business,Windows Vista Enterprise,Windows Vista Ultimate

WinMind is a single-player game. Your goal is to break a secret code.
License: Freeware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP,Windows2003

Spelling, vocabulary & quiz game for whole family.
License: Shareware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP

Challenging word chain puzzle includes 100+ levels, editor, online help.
License: Freeware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP

Unscramble the mystic symbol. A new puzzle every time!
License: Freeware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP

Word game - unscramble familiar phrases. Configurable!
License: Freeware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP

Not 1 but 2 octagonal puzzles!
License: Freeware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP

Simple, yet extremely addictive puzzle/strategy game for all ages
License: Shareware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP

Addictive puzzle game where you must align 5 or more same colored balls.
License: Shareware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP,Windows2003