At first, it's rather easy. You have a game panel of a few colored squares and, using color affecting tiles, your objective is to change your panel to match that of the target. Then it gets progressively more difficult. Josh Tamugaia's Iromeku is not a simple math exercise, it is a simple idea puzzle in which you'll need as much logic as trial-and-error to use and layer all the tiles in the precise arrangement to create an "iromeku" success.
While there is an apparent algorithm involved, one that's easily figured out through experimentation in the beginning, the solutions become significantly more elusive halfway through the 20 puzzle levels. A color guide helps but does not reduce the challenge while an assortment of atmospheric, electro-symphonic tunes keeps the experience just chill enough to lose a lunch break to.