Location: Isle d'Oriens -> scene with Vince after clicking around (Hint: Well, this is more challenging, but the room is in an obvious place. It looks somewhat like a robot junkyard. That's the only hint allowed) - Guardian only

Vince: Want to know a secret?
Vince: I've been secretly working on a transcelular-minifyer and I just tweaked the last adjestments. Do you want to be my unfortunate test subject?
Vince: My last victims shrunk so small that i've lost them somewhere, but if you could see them, I'm sure you would see that they are good and healthy. So are you up for it?

(Options: Shrink me!!! (Continue) | No thanks (Return to the room just before the scene with Vince.))

(shrinking animation)

Vince: Success! And you didn't even explode!
You: So what now? do you have a un-smallerfier machine tucked away somewhere?
Vince: Hmmm...I probably should have build that...Tell you what. I'll go make one, and in the meantime, you can run an errand for me.
You: Not to point out the obvious, but I can't exactly run as fast as I used to when I'm this low to the ground.
Vince: No problem! Here, use this small scale roundelay transportation device.
You: It's a hamster ball.......
Vince: No, it's faster than walking. Now hop in! Or do I need to put a little treat inside?
Vince: I need you to get a small sphere of roqfurt mineral. It smells a bit like cheese, so the vermin down here stole it. I'll put you in the mousehole so you can search their tunnels.
Vince: You have to be very quiet once inside. Do not touch any of the walls or else you'll be detected. Also, try to avoid the giant rat things. Use the arrow keys to move around the maze.

(You're now in the maze.)

Scenario 1
(If you bump into a wall/mouse...)
You've been detected! What would you like to do?
(Options: Try Again (Returns you to the maze.) | Quit (Leave, see below.))
Vince: Too bad you couldn't find it for me. I have good news though! I remembered that shrink ray runs on photosynthetic juice!
Vince: So all you need to do is walk outside and you'll grow back to your normal self.
(Return to the room just before the scene with Vince.)

Scenario 2
(After obtaining the roqfurt...)
Vince: Congratulations! Now I can continue my work! Here is something to thank you.

BATTLE
Level 25 and Below
Vince's Gold (30)
Level 26-49
Vince's Gold (70)
Level 50 and Above
Vince's Gold (100)

Vince: The shrink ray runs on photosynthetic juice, so if you want to get big again, just walk outside. You can come back to my boiler room any time!

(Return to the room just before the scene with Vince.)

Tips Section
• The maze stays the same each time (A full map of the area is NOT allowed and is considered a spoiler).
• All mouse movement has a pattern and stays the same, so try to guess at the pattern from the view that you have.
• Move carefully and try not to rush. There are plenty of safe spots in the area to wait and watch.
• If you're having a lot of trouble, using the maximum game resolution might help, if your computer can handle it.

Source

Pae, http://forums2.battleon.com/f/tm.asp?m=5935514