Catabomb Abyss

Cheat Codes:
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Press [F10] and one of the following keys 

Key      Result
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W      - Warp (Level 5 is secret)
Z      - Freeze Monsters
I      - Extra Items
G      - God Mode
E      - Skip (Exit) Current Level
O      - Overhead View
M      - Memory Usage Info
P      - Unknown
1      - thru [8] give you a scroll
Q      - Exit game
T      - Display tics
V      - Display version number
M      - View memory usage
Scroll - [Scroll number 1-8]

Weak walls:
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Level 1: Windows 
Level 2: Vines 
Haunt Of Nemesis: Statues 
The Well: Water vents 

Defeating Red Demons:
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Hit them once with a Super Zapper.

Strange level:
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Enable the "Level warp" code to display the level selector (1-18).
Enter "20" to access a strange level with tablets from previous 
levels. All the exits lead to level one.

Defeating Nemesis:
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After killing all the demons, cure your self to full health. When 
Nemesis appears, hold [Super Zapper] + [Cure]. You should have a 
quick and trouble-free fight that lasts about six seconds.