Logic maze

A ruleset can be basic (such as "you cannot make left turns") or complex.

Robert Abbott invented the logic maze.

[1][2] The first logic maze ever published, Traffic Maze in Floyd's Knob, appeared in the October 1962 issue of Scientific American in the Mathematical Games column.

in SuperMazes, Abbott says that this "is the hardest maze in the book; in fact, it is possible that no one will solve it.

"[4] Since then, several different versions of it have appeared, made by others, following the same theme, both on paper and in electronic forms.