Pure puzzle games can have a sort of zen effect for some players. Through repetition, players can almost subconsciously solve logic puzzles that would take an untrained person serious thought. When done well, time seems to melt away and all that matters is achieving nirvana through the journey to the solution.
The Japanese puzzles sudoku and nonogram (better known as Picross among gamers) manage to hit that sweet spot for many. Tappingo aims to join those ranks with a new way to recreate pixel images through use of deductive reasoning. It begins with promise, but never manages to reach its full potential.