Online since 2002. The most comprehensive site for all around twisty puzzles.

Codebreaker
CodebreakerA moving hole puzzle where you can can twist the 4 corner tiles all at once.
Sudoku CodebreakerA moving hole puzzle where you can can twist the 4 corner tiles all at once.
Twisted MindA moving hole puzzle where you can can twist the 4 corner tiles all at once.

Twisting RingsA moving hole puzzle where you can can twist the 4 corner tiles all at once.
TwistoManiaA moving hole puzzle where you can can twist the 4 corner tiles all at once.

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