Clue HQ Birmingham: Captain Riddle’s Forgotten Fortune

The game took place mainly in one room, but when out of this room there was a long corridor that answered some more puzzles in the main room, it did not smell great.
At the end of the corridor is a lit room where it was clear you were meant to be able to see into it. but the game ended abruptly with a "WELL DONE" (or words to that effect) and this room is no longer part of the game. But, it's on full display?!