This is a challenge I made up myself a long time ago

Hard difficulty
Only allowed to use Billy when the game forces you to, otherwise he's just a small portable item box and must wait in the main hall of the training facility, or other 'safe areas'. He can't use any weapons except on the centipede and queen leech battles, either.

It's quite challenging and fun, what do you guys think?

Wow, that is a nice challenge. I think I will try it.

Post here if you do, interested to hear how you do on it :]

Ok, I will.

I don't understand why people think you need to fight the centipede as Billy. I fought him as Rebecca because I thought it was funny to have a damsel in distress role reversal.

Only Billy is strong enough to turn the lever that lifts the cage that the key is under, and the centipede shows up and captures Rebecca immediatly after picking up the key.

How could you fight it as Rebecca?

I just switched the positions after billy turns the lever so when so I have the other pick up the key.

I will try it, but last time I had Billy let go of the lever before getting the key the cage fell on top of Rebecca's poor little head and killed her. =X

Wow that happened? I don't remember it well but I know I had rebecca fight the centepede. I had the grenade launcher and everything. How do you normally get the key cause I'm trying to remember what I did different.
If that doesn't work I'll try it myself just to make sure I'm not smoking crack.