So this is your birthday?
You need to get into that abandoned building. Use the broken lamp on the right of the door to get the BULB out. Use the bulb on the pavement to smash it and use the broken bulb on the front door to enter. Walk south and turn to the right. Use the door to enter the next room.
On the table is a KEY. Pick it up. Walk to the south and use the switch under the projector to start the movie. It’s footage of the original House Quest. After the movie walk to the south and use the door. Walk south again and at the crossing of corridors walk to the left. Use the key on the gate to open it and walk up the stairs. Surprise!
Game source: A copy of the game was found here on the internet.