The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

Digital Mayhem

by Kevin J. Lin

There are several solutions, however all are mirrors or rotations of one single solution, shown below:

By only swapping two keys at a time, it can be easily solved in six steps, but no fewer.