Gray Design Associates is the company of David Gray, who developed the Hugo Trilogy.

1991

Hugo's great uncle has been murdered, and, with Penelope as the only witness, she must discover "whodunit".

After their plane crashes, Penelope is bitten by a snake.  Hugo must search the jungle of doom for a cure.

1990

Hugo must save his girlfriend Penelope who is a prisoner in the house of horrors.