A remake inspired by Andrea Gilbert’s Wriggler puzzles, ardeej’s PuzzleScript effort tasks players with getting the “wrigglers” (snake-like creatures) to their designated coloured spots to pass each level. A wriggler can only be dragged by its tail using an in-game cursor, making it slightly more challenging than the original game it was based on.
This version of Wriggler doesn’t feature an undo function, but you could always pull a wriggler out backwards to return it to an earlier position. Even if a particular puzzle is rendered unsolvable, the restart button (R key) can still be used to reset the current level back to its original layout.
The Wriggler remake is playable at this link.