In the Resident Evil mansion in SC Park, go to the four empty hallways to the left and right of the stairways. There is a secret room on the left-most hallway to the left side of the stairs. There, in a treasure chest, you will find a card. In Lost World, there is a yellow door near the card trader. Return to the first room of Lost World, and visit the fake giant dinosaur. Pressing it twice will cause it to break. Once the dinosaur is broken, you may enter the yellow door, which is actually a staff-only room containing a few people and a broken card trader machine. You may do this as many times as desired.