 Cartridges for the system were referred to as " Storyware " , and take the form of picture books with a cartridge slot on the bottom . The Pico changes the television display and the set of tasks for the player to accomplish each time a page is turned . Sound , including voices and music , also accompanied every page . Games for the Pico focused on education , including on subjects such as music , counting , spelling , reading , matching , and coloring . Titles included licensed animated characters from various franchises , such as Disney 's The Lion King : Adventures at Pride Rock and A Year at Pooh Corner . Sega also released titles including their mascot , Sonic the Hedgehog , including Sonic Gameworld and Tails and the Music Maker . 
