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How do I make a gun item only be able to be used when an ammo variable is greater than 1, while at the same time whenever the gun is used ammo goes down 1?

You would need scripting, so in the item script.

If %AMMO < 1

Then %PAGEID := (what ever page id the "out of ammo" page is)

^ What Beta Said -

Need Ammo Variable : %AMMO
Need Damage Variable : %DMG
Need Hit Point Variable for each Goon : %GOON1HP
Need Gun Item : Gun Item with Damage/Ammo Script
Need Gunfire Results Page : Say 100
Need Dead Goon Page : Say 200
Need Out of Ammo Page : Say 500

---

Gun Item Script:

IF %AMMO < 1 THEN $DEST := @P500
IF %AMMO > 0 THEN
BEGIN
%AMMO := %AMMO - 1
%DMG := 1D6+4
%GOON1HP := %GOON1HP - %DMG
IF %GOON1HP > 0 THEN $DEST := @P100
IF %GOON1HP < 1 THEN $DEST := @P200
END

Put this in the item script page:

%AMMO := %AMMO - 1

IF %AMMO < 1 THEN

BEGIN

$DEST := @NONE

END

Thanks everyone :)