Sudoku Maze is a variant of sudoku in which 9-square paths are hidden in a grid of numbers. Paths and numbers must be solved concurrently in order to complete the puzzle.
Check out http://sudokumaze.com
for 1000s of puzzles.
Disclaimer: I created Sudoku Maze during my spare time last year. I really
wanted to discover what a mazey version of sudoku would look like, and couldn't find anything online.
Sudoku Maze is a generalised form of sudoku in which the "big" (3x3) squares are unraveled into 9-square paths . The paths are initially unknown - you need to find them!