Are there alternate or secret exits for some levels in New Super Mario Bros for Wii?

In Super Mario World on the Super NES (16-bit), some levels on the world map were represented by a different-colored globe, which indicated that there were secret exits hidden on them that would open up a new path. This usually involved finding a hidden lock and key, and reuniting them.

In New SMB for Wii, there appears to be a similar setup. Is the same true, and if so, what colors indicate that there are multiple exits?

Solution 1:

There are 14 secret goals to be found in the game.

here's the list and where they are.

Solution 2:

Yes, there are secret exits, but I don't believe there's a color to indicate multiple exits. You just have to figure it out, but the hint videos might be able to provide some assistance.