Enter POOKY on the high-score table to be able to restart the game on the level you died on.

Create a text file with the following information and save it with the name RICK.DBG:

G266
T
G37
T
G9FE
T
ECS: 02 F3 C6 06 8C 6E 06 C3
G
T

Then type the following lines for infinite lives:
DEBUG RICK.COM < RICK.DBG