Catacomb is an original arcade game that came out in 1983 for the Coco 1/2 (not to be confused with the Coco 3 only game released in the public domain in 1987 by L. Miller, with the same name).
The game has two different stages, but a rather unique thing about it is that you can switch from the Catacomb stage to the Hyperspace Corridor stage whenever you want to; you do not have to finish the Corridor stage first. The Corridor stage has you trying to collect fuel while dodging monsters; whenever you think you have enough fuel to travel the entire hyperspace corridor to your mothership, you hit the joystick button to switch to the Hyperspace corridor. In this sequence, you can collect fuel on rare occasions, but you also must shoot opposing ships, and/or dodge them (there are several kinds). You can also vary your speed in the corridor; you can't in the catacomb stage.
Title: Catacomb
Author: Roger Smith
Publisher: Oregon Color Computer Systems
Released: May 1983
Requires: Color Computer 1,2,3, 16K RAM, tape or disk, joystick.