Yoshi's Story Tech Demo – Nintendo's Leaked GBA Hardware Showcase on Cartridge Before the Game Boy Advance launched, Nintendo built internal tech demos to showcase what the hardware could do. This is one of them — a Yoshi's Story demo, commonly known as "Yoshi Demo," created to demonstrate the GBA's graphical and gameplay capabilities using assets and style drawn directly from the 1997 Custom cartridge, plug and play. Compatible: GBA, GBA SP, DS, DS Lite.