Yes, your characters are VERY believable. I think you've captured their thoughts on the whole thing pretty nicely. A word of advice though. I think you should do the guide's voices in italics or something. Just so its easier to tell when they're talking.
Anyhow.
I absolutley love this. So you'd better update soon, ok? =D

Okay, two things before I rant about how much I love this story:

1)

[Q“Go out there? No way! Do you know how hot it isd?”]
[Oran! Poinbts off for that!]

Just two spelling mistakes. ;)

2)

About your characters being believeable... Well, to me they are. But, somehow, they don't seem to be. I mean... maybe it's the setting (I guess; How do you make things believeable in a twisted game like that but...) I can't them being, REAL - if you get me? ... right?

Anywyz - YAY-NESS! ACTION! (Sorry, I love the stuff!) 'Twas a good chappie... NOW WRITE NUMBER FIVE! :D

-sigh- somehow I missed the alert. never mind...

anyway,

WHAT?!?!??! You can't leave it THERE! That's so... unfair! :O

I demand you update at once! And yes, I am addicted to your story now.

Okay, my review for second was just me, getting it all out. (`¬_¬) Here's the Break Writer's Block review...

Your summary was excellent. I checked it out AFTER I read the story (which was a bit weird I know) but it definitely made me come back to read it.

I loved the final line of this chapter (1) because it seemed... believable. It was something I myself, would do if stuck in that situation. Just... laugh.

It definitely made me carry on though. I loved when they'd just landed in the desert...["Are you going to get up or is that indentation a bed enough for you?"] funnyy...

Personally, I prefered Morgan. I dunno why. It just seemed to me that there was more about him, than the person who's narrating. It's like all the tests are being put on him. Perhaps you should focus on some others too.

Overall, awesome!

Ah-mazing.

I knew you said that you were going to have it different from mine... (I changed my penname), but... that was so... different! Like, I LOVED how they all have a "Person" to guide them through. And ... in the desert, too!

one thing I didn't like though, was the many main characters. Like, I'm still trying to work out who's telling the story - I'm sure I'm losing it but...

Anyway, overall (despite my terrible memory for names) I REALLY like this; it's definitely original. ;)