Recently on an episode of Game Trailers TV, Nintendo's Bill Trinen said that Super Mario Galaxy 2 will feature Super Guide, the help system that was used in New Super Mario Bros. Wii. The system revolves around a computerized avatar taking control of the player and finishing a particularly tough level on their behalf.

Trinen did not specify if the system would work in a similar fashion in Super Mario Galaxy 2, stating, "This time around they're looking at trying to find a way to take advantage of it, maybe improve on, maybe something a little different than what was done in New Super Mario Bros. Wii. But I think it's something that you can look forward to."

In New Super Mario Bros. Wii, the Super Guide would not activate until a player died eight times on a given level. On the next attempt, a green block would appear at the start, and if the player hit the green block, Luigi would appear on-screen and play through the level until the player chose to take control again.

Source: Nintendo World Report