What is this TRS-80 game with castle and maze-like walls?

Ghost's Gallery!

Ghost's Gallery is a graphics game for the TRS-80 for one or two players. A sixty room castle is drawn on the screen. To win, a player must capture the ghost with the key and get to the front door before the ghost or other player captures him.

I've played it (emulated) and talk about it here (29:17)

A lot of great TRS-80 games have no images or YouTube videos.