lists the official instructions alongside community-submitted "MOCs" (My Own Creations) for the same set.
lego® mindstorms® nxt 2.0 - Building Instructions - Download
: A complex stationary robot that showcases the advanced color-sensing capabilities of the 2.0 generation.
The safest, highest-quality source for any is LEGO’s official customer service website. LEGO has a dedicated service for all retired sets.
If you have just downloaded the PDF and are wondering where to start, these are the four core designs included in the official documentation:
