Tip Networks are small televisions in Super Mario Galaxy 2. They look like signboards, and are yellow and green. They give Mario hints about upcoming obstacles that lie ahead. To activate them, Mario must stand in front of them. Tip Networks are similar to the Hint Movies in New Super Mario Bros. Wii except the fact that Mario doesn't have to pay to watch them. When a video on a Tip Network is done, all enemies reappear. However, Tip Networks do not appear when playing as Luigi.
If you look through first-person view while standing in front of a Tip Network, you will see an infinite mirror effect on the screen.