Find a path that starts in the upper-left letter and ends in the lower-right letter, that goes through each letter once and repeats only the password (given below the grid). The path may only travel in the eight standard directions and may not intersect itself.
(Rules and example from PGP IB)
History of the puzzle
Appeared on WPC 1999/Part 5, an "Innovative" round. The puzzle was called "Zigzag." The author is unknown.