The Green Gallery is the fourth chapter of the excellent puzzle Phantom Mansion series. I'm sure you already know the rules, guide Hector around each room, collecting souls to open the exits. Use keys to open locked doors (tick), push boxes into the void to bridge gaps (tick), stand on switches to make thing happens (tick), avoid the baddies (tick) and use the scrolls if you get stuck (tick!). This fourth chapter is as enjoyable as the previous ones. Have fun!
