The cheat codes for this game are very tricky. Press [F12] to enter the codes. Some codes allow others to work properly and depend on them to be entered first. Below is a list of codes and which codes must be entered first:

Cheat Enabler: "Imarealweenie"

Codes used after this cheat is enabled:
"enemies" - list enemy hit points.
"sight" - show line of sight.
"spy" - show debug numbers.