This is a half cheat half tip!

On the first level ( in the hotel ) when u get the key and get taken to the right floor, once you get there, take 5 laps around the floor and then stop at the lift for about 1 min.

(DOESN'T HAVE TO BE EXACTLY 1 MIN) then go to the room where u shud get all ur weapons, now u shud have all weapons unlimited health, all secrets, all levels and all cheats.....

Cool eh????