Look at the base of the lamp in front of you.
Under it is a PAPER. Take it and look at the diagram. Turn to the right and click on the corners of the border of the picture, in the order as indicated on the diagram. A cat will appear in the moon. Leave the picture and see that the eyes of the skull turned red.
Turn to the right and open the window. Count the number of bats (3), ghost (6) and blue lights (2). Leave the window and turn right again. There’s a safe and a square in circle on the wall. Use the square to look inside and take the DISC out. It has some letters on it. Use the top of the safe and see things we’ve seen before. Enter 362 as code and pull the handle. Take the second DISC out.
Look at the bottom part of the safe. You need to get all pumpkin’s eyes lit. The fastest way to do this: number them from 1 to 9, left to right, top to bottom. Then click 1, 2, 4, 7, 8 and 9. Use the handle to open the door and take the third DISC out.
Leave the safe and turn to the right. Use the handle on the door to see the three empty circles. Use the three discs from your inventory to spell HAL LOW EEN and use the handle again to leave the room.
Game source: A copy of the game was found here on the internet.