Challenge Mode: 
Activate challenge mode by getting all 3 colored pikmin(Yellow Blue and Red)

Olimars Ship: 
You are not required to find ALL 30 parts for Olimars ship, only the vital 
ones. It should tell you in the description what he needs the most.

Colored Pikmin Locations:  
The Red Pikmin is located in the Impact Site, the yellow in the Forest Of Hope.
 The blue is in the Forest Navel.