Gua-Le-Ni, also known as "The Horrendous Parade" is an action puzzle. The game takes place on the desk of a British taxonomist, as he goes through a book representing mystical creatures (inspired by mixing body parts from real world animals) the player has to use taxonomic cubes to put together syllables, and give the mystical creatures, the right name. Gua-Le-Ni is the first commercially-released casual video game whose development and tuning were guided by the analysis of its players' psychophysiological responses.