So what is Demo Play? Continuing their mission to make gaming accessible to everyone, gaming legend Shigero Miyamoto explains that It’s a game assist feature that can be programmed into titles to help games traverse difficult areas.

From Games Industry biz:
“In New Super Mario Bros Wii, if a player is experiencing an area of difficulty, this will allow them to clear troubled areas and take over when they’re ready,” said Miyamoto. “And yes, we’re looking into this for future games, too.”