I found another one in game 3 of return to haunted house and it is huge. I think it may be the Ultimate Easter Egg from the contest. The first screenshot is the room that leads to the easter egg;. You need that circle with the cross to unlock the castle it is in and then the dot and some objects to enter. The blue room is part of a huge part of the map made to look like the original Haunted House game with credits hidden on all four floors.
As much as I don't want to give out any hints, you are very close in this post...