on the downtown sunnydale level you can find everyone and still not beat the level. follow my directions and youll understand what i'm talking about.
step 1: when you go inside of the theater room with willow in it get the turnstile ticket, go into the cutscene with willow and go downstairs.
Step 2: go to theaters bathroom and jump out the window. then fight the first vampire that comes but dont kill him. keep kicking him to the ground until he gets knocked out or takes a while to get back up.
step 3: head back upstairs and fight the vampire who should be wearing a jacket, but dont kill him. let him follow you to willows room. when you and the vamp get to willows room kick the vamp to the floor and make sure that when he hits the floor he falls right on the double doors. put your stake away and open the door.
Step 4: when you go through the double doors willow will just stand there and buffy wont even pour the purple stuff on willow. you can walk and even hit willow and nothing will happen. after the vamp gets up stake him. and youll have freedom to play the level as long as you want and where ever you want after finding everyone. trust me, i discovered how to do this just by experimeniting with the game. i'm not sure if stuff like this works on the other characters in this level but its worth a shot. although i'm not sure if this level cheat tactic works on xbox but theres only one way to find out. and this level cheat is not a hoax. i've done it many times. good luck.

That sounds interesting, maybe I'll check it out once I have the time. I wouldn't call this a cheat, by they way, it sounds like a glitch to me. Cheats are deliberately placed in games by the developers to enhance the game-play for the players, and I imagine that the game developers didn't desire what your describing to be in the game.

It's kind of funny actually, haha.

"Hey guys use this cheat to do everything required to end the level but not be able to finish it!"

Cool I can't wait.