However, someone recently pointed out to me that they were pretty useless since the parts in Keen do not add, as ammunition does, but set a value. (Thus, getting the pogo sets the value of 'pogo' to 1, even if Keen starts the game with 20 pogo, getting a pogo tile will set it to 1) This is of course no good, so I have found the required patches to make it so various things add (20 pogo + 1 pogo = 21 pogo)
With these patches you can do things such as getting Keen to save 8 cities to win, or turn 'spare' ship parts (Seriously, 4 is so cliche!) into new points, or negative items or pogo stealers, whatever.
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#Item counters ADD (Instead of SET):
%patch $4446 $83 $06 $94 $AA $01 $90 #Joystick
%patch $445E $83 $06 $96 $AA $01 $90 #Battery
%patch $446A $83 $06 $98 $AA $01 $90 #Vaccum
%patch $4452 $83 $06 $9C $AA $01 $90 #Whiskey
%patch $44AB $90 $83 $06 $9A $AA $01 #Pogo
#Type table for patches:
$94: Joystick $96: Vaccum $98: Whiskey $9A: Pogo
$9C: Battery $9E: Yellow card $A0; Red card $A2: Green card
$A4: Blue card $A6: Level 1 $A8: Level 2 $AA: Level 3
$AC: Level 4 $AE: Level 5 $B0: Level 6 $B2: Level 7
$B4: Level 8 $B6: Level 9 $B8: Level 10 $BA: Level 11
$BC: Level 12 $BE: Level 13 $C0: Level 14 $C2: Level 15
$C4: Level 16 $C6: Lives $C8: Ammo $CA: Points
EXAMPLE 1: Keen must save 8 cities to win
Here we just change the joystick to add, then use some patches from the linked topic above so that we need 8 joysticks (Cities) and 0 of anything else to win. For compactness I left out any status box patches to fiddle this.
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#Get 8 cities to win:
%patch $4446 $83 $06 $94 $AA $01 $90 #Joystick adds
%patch $8022 $94 $AA $08 $72 #Joystick (8 or more)
%patch $8029 $9C $AA $01 $74 #Battery (0)
%patch $8030 $96 $AA $01 $74 #Vacum (0)
%patch $8037 $98 $AA $01 $74 #Whiskey (0)
EXAMPLE 2: Joystick is 1 bullet
Here I change the Joystick to give 1 ammo and set its winning value to not 1 (Note the condition $74 and the type is $C8, raygun ammo)
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#Joystick 1 ammo:
%patch $4446 $83 $06 $C8 $AA $01 $90 #Joystick adds ammo
%patch $8022 $94 $AA $01 $74 #0 joystick to win
There are even ways (Via modifying the status box) to place a '% complete' box in the status window (Using parts tiles) that can give an idea of how much of the game you have done, and other such things, I hope this lets us escape the limitations of 'get 4 things and leave' that have plagued Keen 1
Enjoy! :)