Instant Insanity II is a sliding mechanical puzzle developed by Phil Orbanes (see Figure 1).
It involves aligning four rows of colors by sliding the tiles as in the popular 15 puzzle
(Figure 2), and by mechanical rotations reminiscent of Rubik's Cube. It resembles the
1967 Parker Brothers puzzle Instant Insanity. Versions of the latter puzzle appeared over
a century ago, and the graph theoretic solution is widely known