Puzzle games are like muscles. Work them out and they'll grow nice and big. Get obsessive and work out too much, though, and you're liable to strain them.
Match-three puzzle games has so long dominated the genre that a slower, more cerebral game like Denki Blocks! feels pretty good - like stretching your unused mental muscle.
The truth is that it's just as old as most any puzzle game, yet namesake developer Denki has crafted a methodical game that won't aggravate the strained puzzle genre, but is sure to give your mind a workout.