 For instance, Yoshi was unable to use his tongue; nor could he throw eggs, in spite of being able to obtain them.Screenshots from the demo also show the presence of giant Shy Guys, that were primarily designed to demonstrate system's advancement from the Game Boy Color's 10-pixel sprite limit.In spite of the fact that Nintendo had published a promotional image of a Game Boy Advance with the tech demo running on it, it was never released as a completed game.