Some of the games starring Jiji the penguin include "ST Math," "KickBox" and "BigSeed." They were released by Mind Research Institute and are available for PCs, Macs and tablet devices on MRI's website.
While all three games are free as of 2015, "ST Math" requires a school login in order to match its content to the math homework assignments of elementary school students. "BigSeed" was restricted to elementary schools as well, but now there is an expanded version of the game that is available to everyone. While these games were designed with kids in mind, adults have a great time playing them as well, as they provide entertaining and challenging puzzles.