How do you climb up the walls on sonic unleash?

In the wii version there is several ways to climb. One way is you wait until it flashes and says press b and our grab onto the wall.

Another way of climbing is when you want to climb up a poll, you hold b while moving the wii remote up and down alternately.

If you want to strafe across a wall just start walking sideways across the wall and he will strafe across it.