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O.K. Yah!

DESCRIPTION | POKE(s)
Infinite lives | 41296,24
Immunity | 39996,24:39997,21:40416,17

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##
Oberon 69

DESCRIPTION | POKE(s)
Infinite energy | 44429,42
Infinite ammo | 44484,0
Infinite time | 44609,0

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##
Obliterator

DESCRIPTION | POKE(s)
Infinite energy | 33595,182

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Oblivion

DESCRIPTION | POKE(s)
Infinite lives | 62987,58
Immunity | 60964,24

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Octagon Squad

DESCRIPTION | POKE(s)
Infinite lives | 33516,0

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##
Octan

DESCRIPTION | POKE(s)
Infinite Lives | 58289,0:58411,62

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/OCTAN.SNA
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Octipede

DESCRIPTION | POKE(s)
Infinite lives | 27163,0
Immunity | 25567,33

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Odd Ball

DESCRIPTION | POKE(s)
Infinite Lives | 50346,0
Infinite Inflation | 44668,0

LOAD FROM RETRO GOLD ... retro:games/spectrum/O/ODDBALL.SNA
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##
Odd Job Eddie

DESCRIPTION | POKE(s)
Infinite lives | 30349,0
Immune to killer landscape | 29353,24:29354,1
Immune to nasties | 30254,58:30266,58:30278,58

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##
Odyssey 1

DESCRIPTION | POKE(s)
Infinite lives | 25300,0

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##
Official Father Xmas Sim

### (AKA The Official Santa Sim)

DESCRIPTION | POKE(s)
Infinite Time | 33122,0

Who do you suppose endorsed this game, to say that it is the "Official" game? :-)
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##
Oh Mummy!

DESCRIPTION | POKE(s)
Infinite Lives | 24381,0:33337,0

LOAD FROM RETRO GOLD ... retro:games/spectrum/O/OHMUMMY.Z80
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Oink

DESCRIPTION | POKE(s)
Tom Thug |
Infinite Lives | 47195,0
Pete's Pimple |
Infinite Lives | 49665,0
Rubbish Man |
Infinite Lives | 47182,0

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/OINK!.SNA
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##
Olli & Lissa

DESCRIPTION | POKE(s)
Infinite Energy | 36060,201:36713,225

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/OLLIE.SNA
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Olli & Lissa 2

DESCRIPTION | POKE(s)
Infinite lives | 38311,201
Immunity to nasties | 35434,24

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##
Olli & Lissa III

DESCRIPTION | POKE(s)
Infinite Lives | 37274,0
Fall Any Height | 33601,24

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/OLLI3.Z80
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##
Omega 1

DESCRIPTION | POKE(s)
Infinite lives | 61768,0
Infinite time | 62516,0
Infinite ammo | 63116,0
Infinite energy | 61741,0

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##
Omega Dimension (AKA Dimension Omega)

DESCRIPTION | POKE(s)
PART 1
Infinite energy | 32947,0
Infinite time | 31799,0:31803,195
PART 2
Infinite energy | 33122,0
Infinite time | 31296,0:31930,195

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##
Omega Zone, The

DESCRIPTION | POKE(s)
Infinite lives | 49874,0

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Ometron

DESCRIPTION | POKE(s)
Immunity | 24654,195

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On The Run

DESCRIPTION | POKE(s)
Infinite Energy | 39025,0
Infinite Time | 43660,0
Infinite Ammo | 35784,0

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/ONTHERUN.SNA
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One For The Road

DESCRIPTION | POKE(s)
Infinite lives | 27066,0
Immunity | 27051,24

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##
One Man And His Droid

DESCRIPTION | POKE(s)
Start level from password | NOMISLUAP[A,B,C,etc]

Just enter NOMISLUAP [Yes, that means PAULSIMON backwards] followed by a letter (A=1, B=2 etc). Saves having to remember all those pesky codes. This previously undocumented cheat comes courtesy of Mr Clive Brooker, the author. Ta matey!
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##
Oops

DESCRIPTION | POKE(s)
Infinite lives | 28583,201
Infinite time | 35386,0
No flying nasties | 30768,0

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##
Operation Gunship

DESCRIPTION | POKE(s)
Infinite Fuel | 53926,0
Infinite Bullets | 55976,0
Infinite Rockets | 56304,0
Infinite Armour | 53977,201
Men To Save = x | 53377,x (x= 1-8)

IMPORTANT!
Make sure you don't put any more than 8 men to save, as the game only puts the 8 in set locations, and you'll never finish!
LOAD FROM RETRO GOLD ... retro:games/spectrum/o/OPERGUN.SNA
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Operation Hanoi

DESCRIPTION | POKE(s)
Infinite Ammo | 52885,0
Infinite Lives | 28863,0
Infinite TNT | 33488,0

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Operation Hormuz

DESCRIPTION | POKE(s)
Infinite lives | 47123,0

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Operation Thunderbolt

DESCRIPTION | POKE(s)
Infinite ammo P1 and P2 | 42511,0
Infinite grenades P1 | 42328,0
Infinite energy P1 | 42918,183
Infinite grenades P2 | 42396,0
Infinite energy P2 | 42853,183
Infinite Credits | 41214,0
Start level = x+1 | 37910,x (x = 0-6)

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##
Operation Wolf

DESCRIPTION | POKE(s)
128K version
Infinite Magazines | 40727,183
Infinite Damage | 41150,0:41762,0
Infinite Continues | 40838,0
48K version
Infinite grenades | 40710,0
Infinite ammo | 40681,0
Infinite continues | 40784,0
Damage = x | 40733,x (x = 1-255)
Infinite Damage | 41708,0

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/OPWOLF.Z80
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Orbiter

DESCRIPTION | POKE(s)
Infinite lives | 29112,0

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##
Orbix The Terrorball

DESCRIPTION | POKE(s)
Infinite Lives | 65529,0:32127,0:32188,0

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/ORBIX.SNA
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##
Oriental Hero

DESCRIPTION | POKE(s)
Infinite Energy | 28995,0
Energy = x | 27472,x (x= 1-255)

Change x to whatever value you wish, using the POKE option on the ZXAM GUI
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##
Orion

DESCRIPTION | POKE(s)
Immunity | 37319,201
Lives = x | 38059,x (x= 1-255)

LOAD FROM RETRO GOLD ... retro:games/spectrum/o/ORION.Z80
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##
Orion (Proxima Software)

DESCRIPTION | POKE(s)
Infinite lives | 27574,0

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##
Osten

DESCRIPTION | POKE(s)
Lives = x | 26261,x (x = 1-28)
Infinite lives | 26558,0

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Out Of This World

DESCRIPTION | POKE(s)
Infinite lives | 26984,182

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##
Out Run

DESCRIPTION | POKE(s)
Infinite Time | 40623,0

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##
Outcast

DESCRIPTION | POKE(s)
Infinite lives | 57227,0

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##
Overkill

DESCRIPTION | POKE(s)
Infinite Lives | 42968,0

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##
Overlander

DESCRIPTION | POKE(s)
Infinite lives | 29521,0
Infinite Energy | 27296,0:32062,0
Infinite Money | 31153,42:31513,42
Lives = x | 61422,x (x= 1-255)

Change x to whatever value you wish, using the POKE option on the ZXAM GUI
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