Super Mario Galaxy 2

• On
  some stages, Mario can find an egg, smash it open and hop onto the back
  of Yoshi. Yoshi can use his tongue to grab items and shoot them back at
  enemies, or to snag attach points and swing across chasms. Yoshi has an
  interesting diet. When he eats a Dash Pepper, he gets so hot
• and
  frenzied he can run up steep inclines and vertical walls. When he eats a
  Blimp Fruit, he inflates like a balloon and floats to new heights.
• New power-ups include a drill that Mario uses to tunnel through the planet's surface all the way to the other side of a planet.
• Skilled players will want to collect new Comet Metals, which will unlock harder Levels with even more challenges.