The cutest match-3 game on the App Store, Piyo Blocks, hardly needed a sequel. It seemed already complete, offering simple yet compulsive gameplay and a fully-formed aesthetic. Piyo Blocks 2 initially seems like an advertisement for Piyo Blocks 2 HD, the new iPad edition that features redone visuals and a simultaneous two-player mode. As it turns out, it's a valuable new expansion. Big Pixel has tweaked the game in small but significant ways.