"Official" Strategy guide?
 

So I decided to just buy the paperback verison of Abe's Oddysey complete walkthrough here, cost about $6.99 including shipping.

Here's the one I bought:
http://www.amazon.com/OddWorld-Oddys...7306176&sr=1-1

Here's another one that also says 'official':
http://www.amazon.com/Unlock-Secrets...7306348&sr=1-1

Is this guy legit (the first one)? Or did someone just make it up in their garage?

Can't find it on either Wikipedia's (incomplete) list or Prima's own archive, perhaps an older member might be better equiped to answer this.

I have the first one myself.
The second one just looks like it has a few extras added. There might be a difference in what version it is for too, the second states it is for the playstation version. Maybe those are the differences *shrug*

Don't trust him.

I will continue to endorse Sinjin's unofficial walkthroughs here and here.

Why not?

I'd rather use GameFAQs

I'll buy it. i've never saved all 99 and i want the poster.