GordiusGames.com
Twinban
Sokoban variation
60 levels
Sokoban
Classic Sokoban
60 levels
Bead Patterns
Create bead patterns!
(most of them having fractal-like properties)
More than 20 million patterns. :)
Download them as PNG files, or save the permalinks.
Xonix
Two player version of
the classic xonix game.
Combination Lock
Instead of players, here you direct all the boxes.
Boxes move if they are pushed by other boxes,
or the painted arrows are matching the pressed direction.
Arrows Lock

Every box is stepping when the matching arrow key is pressed.
However, each may be pushed by other boxes. (One box has enogh power to push at most one other box. Two boxes may push two.)