Hint House - missing green key

[Semi-Native]

Missy, turn on Room Numbers by hitting Command + D. I think you may have missed going down that vine. Look at your last screen shot, where Jack is on the vine in the room with the 2 yellow doors. There's a vine to the right that leads down. Go down and you will find yourself in Room 16105. Go down the ladder into 16305, and the other yellow key is there.

rose, you'll find Hint House in MM-HD, Episode 1, top left on the map.