Gateway 2 Walkthrough - Third Door
Walk out into the next area and you'll notice that it just has a light and a phone. Just like the notepad says, she's watching. You need to turn the light on and off three times. You should see a light flash in return.
Now look at the notepad. You need to use the pen to black out enough of the bottom section of the pad to reveal a hidden phone number. In case you don't want cramps in your hand, it should be 86763454. If it doesn't work, then just use quick back and forth horizontal strokes to find the numbers, then color them in to make it clear.
Pick up the receiver before you dial, then punch in the numbers. If you did it right, then someone will answer and open the door.
Walk forward and enter this room with the sprinkler and the light. Use the lighter to set off the sprinkler and open the door.
Walk forward to the kitchen. The tape is just sitting there on the counter. Pick it up and try to walk out. A pair of eyes will look in on you though. This puzzle is pretty simple. Open the fridge door and step behind it. The eyes should start to blink and then eventually close. Once they close, the door will open. Walk through the door to get back to the hallway.
The sprinkler is still going so we need to override the alarm. If you look in your inventory, you still have a mirror. There's also a lamp here. Step under the lamp, just like before, and use the mirror on the water. Note, that's the water, not the sprinkler. The light will go through and show a unique rainbow. If you noticed, the override panel is based on colors, so we're all set.
In case you have trouble with the colors (well, Gateway 2 has a special mode for those who are actually color blind) just know that it's supposed to be Blue, Purple, Yellow, Green, Red and Orange, in that order. I thought the blue and purple were off, for what it's worth.
The sprinkler will shut down and the exit will open.
You'll see our friend again, but this time there's no extra puzzle. Just follow her out and use the tape on the VCR to download another two clips.