Mario's Face (lost Nintendo DS tech demo; 2004)
From The Lost Media Wiki
Mario's Face is a Nintendo DS tech demo Nintendo showed in 2004 to show off their new handheld console, the Nintendo DS. The player could use the stylus on the touch screen to grab parts of Mario and Wario's faces and pull and stretch them, similar to the title screens of Super Mario 64 and Super Mario 64 DS, as well as minigames in the first three Mario Party games. It hasn't been shown since then, and hasn't been dumped.