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Leisure Suit Larry Debug Mode
In games like LSL2, LSL3, KQ1 (1990) you can enter Sierra's debug mode by pressing LSHIFT RSHIFT GREY -
All global variable values can be changed. Changes take effect after exiting DEBUG mode.
 
Global variables Notes
1 - Game ID (Example kq1) Read only (@)
2 - Room number (Ex. rm8 for room #8) Read only
3 - Speed 0 - Max, but 99 is quite slow
4 - Unknown  
5-8 - Something from EventHandler  
9 - Pointer to object inventory Read only
12 - Previous scene number  
13 - Scene number Can be used for teleport.
14 - Breakpoint flag If non-zero, Auto-DEBUG on room CHANGE
15 - Score New score is displayed only after next non-DEBUG change.
16 - Max Score New score is displayed only after next non-DEBUG change.
30 - Pointer to SG Directory. Use INSPECT to view SG directory.
Global variable's marked with (@), attempted value changes have no effect. They are automatically restored. Here are the debug commands.
 
Key - Command Notes
q - Quit Quit immediately
t - Temp variable Inspect temp variable
a - Inspect acc
i - Inspect See chapter "Inspect"
o - Object See available objects.
r - Resources See resources
s - Send stack  
d - Display memory  
f - Free heap  
g - Global variable Inspect global variable
l - Local variable Inspect local variable
b - Break in (If object value is changed, Auto-DEBUG)  
c - Inspect current object  

Inspect subcommands
Keys Effect
Up, Down, Left, Right Scroll
Enter Next item
[,] Move to address
i Inspect
e Edit
c Collection: If you press C while inspecting Inv, you can get Inventory List.