Castlevania (NES 1987) Game Genie Codes

Castlevania (Konami 1987)

OXNGLZVK - Infinite lives
AXOGOPIE - Start with 40 power hearts
ASOGOPIA - Start with 80 power hearts
SXXXYAAX - Infinite time
GZOGYUSE - Keep weapons after losing a life
ZEUTAYAA - Gain rapid fire shots on weapon pick-up
KZSSEZKA + KXESUZKA - Weapons don't use power hearts
PANKXPGA + PANGSAGA - Start with 1 life
AANKXPGE + AANGSAGE - Start with 8 lives

Section Z (NES 1987) Game Genie Codes

Section Z (Capcom 1987)

SXOPUIVG - Infinite lives
PEXSIZLA - Start with 1 life
TEXSIZLA - Start with 6 lives
PEXSIZLE - Start with 9 lives
ZAUNUZAE - Energy tube gives full energy boost
NNNOUTSY - Autofiring capability

Kid Icarus (NES 1987) Game Genie Codes

aka 光神話 パルテナの鏡, Hikari Shinwa: Parutena no Kagami (Japan 1986)

ZAKSXTPA - Small hearts worth 2 energy points
IAKSXTPA - Small hearts worth 5 energy points
GPKSSVZA - Big hearts worth 20 energy points

Pixels arranged by Max Capacity

Ice Climber (NES 1985) Game Genie Codes

OKEIPGVS - Infinite lives
ATKSALAZ - Become invincible
AEXKTGLA - Start with 1 life
IEXKTGLA - Start with 6 lives
AEXKTGLE - Start with 9 lives
GPUKOAZX - Super jumping power
ELKITLEY - Monsters bump you instead of killing you
VNSKXUNN + ZESKULPA - Players double speed
SNSKXUNN + LESKULPA - Players triple speed

King's Bounty (Sega Genesis 1991) Game Genie Codes

New World Computing (1991)

R17A-R6V0 - MASTER CODE--MUST BE ENTERED
NWWT-EAFW - Start with days left at 100
7CWT-EGFW - Start with days left at 1,000
5WWT-ELFW - Start with days left at 1,500
4CWT-ERFW - Start with days left at 2,000
VCWT-FGFW - Start with days left at 5,000

1XYT-BGR2 + AHYT-AAG4 - Always have 1 troop in each army in battle
1XYT-BGR2 + CXYT-AAG4 - Always have 20 troops in each army in battle
1XYT-BGR2 + GMYT-AAG4 - Always have 50 troops in each army in battle
1XYT-BGR2 + NXYT-AAG4 - Always have 100 troops in each army in battle
1XYT-BGR2 + 9MYT-AAG4 - Always have 250 troops in each army in battle
1XYT-BGR2 + 8XYT-ACG4 - Always have 500 troops in each army in battle

2AXT-DCTG - Never lose control of an army
AMBA-AA84 - Recruiting does not reduce population of troop dwellings
AKWA-CA9Y - Recruitment and boat rental are free
RGNA-A6YY - Armies work for free
CBCT-AA6T - Never run out of days

RoboCop vs. Terminator (SEGA Genesis 1993) Game Genie Codes

RoboCop vs. Terminator (Sega Genesis)

A4MB-TA6C - Invincibility
AEGB-TAD4 + AEJB-TAFL - Start with life at near 0
CAGB-TAD4 + CAJB-TAFL - Start with life at 1/4 full
EAGB-TAD4 + EAJB-TAFL - Start with life at 1/2 full
GAGB-TAD4 + GAJB-TAFL - Start with life at 3/4 full
TAGB-TAD4 + TAJB-TAFL - Start with life at 2x full
RHEV-R60A - Infinite lives
ACLB-TAC8 - Start with 1 life
ALLB-TAC8 - Start with 3 lives
BLLB-TAC8 - Start with 11 lives
HWLB-TAC8 - Start with 61 lives
NRLB-TAC8 - Start with 100 lives
RGAV-T6TR - Each Robocop head worth 0 extra lives
ACAV-VJTR - Each Robocop head worth 2 extra lives
ACAV-VTTR - Each Robocop head worth 4 extra lives
ACAV-VATR - Each Robocop head worth 8 extra lives
AC4V-RABR - Start with 0 continues
AG4V-RABR - Start with 1 continues
A04V-RABR - Start with 5 continues
BG4V-RABR - Start with 9 continues
A4RB-TA20 - Infinite continues
AD8B-S16J - Super jump
AD8B-SV6J - Mega-jump
AJ5B-TA32 - Enemies killed with 1 shot, except bosses
DLLB-TA3N - Don't lose special weapons when you die

A Boy and His Blob (NES 1989) Game Genie Codes

I never could beat A Boy and His Blob. But pretty soon here, I'm going to give it a go. I picked out the most useful codes, the ones I might use. Here's a fun fact: In the Japanese version, the main character is represented by a different sprite than the American version.

ZAULNGIE - Double lives
GXXEOPVG - Infinite lives
AAVKIPPA - Infinite Jellybeans
SXEEZAAX - Fast play
AVOPVGEI - Never take damage from enemies
SZXLXKSU + YYXLUGEY - Gives 101 of all starting Jellybeans

T&C Surf Designs (NES 1987) Game Genie Codes

I don't know why you'd want to cheat at T&C Surf Designs. After all, it's a skill-based game (I'm not too shabby at it, either). I suppose if you were playing with a rookie or small child you could handicap it for them. Yeah, I'll go with that. To be honest, I just wanted an excuse to play this game again.

GXUZZZVG - Infinite lives for skating
GXNKALVG - Infinite lives for surfing
PEOGILZA - When surfing lose only 1 symbol
PAEZYALA - When skating lose only 1 symbol if you fall off
GXKLXAVG - Stop timer
LESPGZPA - Increase time

Dr. Mario (NES 1990) Game Genie Codes

Dr. Mario is one of those games where cheating the game is really just cheating against yourself. But theses codes aren't like that. These codes are weird codes, the kind that change the game dynamics entirely. If you really want a challenge, try connecting 5 blocks in a row instead of 3.

GZNEVIVT - Vitamin capsules don't fall

To complete a vertical (upright) line

GEXPYGLA - 5 in a row needed instead of 4
IEXPYGLA - 6 in a row needed instead of 4
TEXPYGLA - 7 in a row needed instead of 4

To complete a horizontal (flat) line

GAKPPZLA - 5 in a row needed instead of 4
IAKPPZLA - 6 in a row needed instead of 4
TAKPPZLA - 7 in a row needed instead of 4

When two or more rows or columns are eliminated at once in a 2-player game

AUVONUAO - More pieces sent across to other player
GXXOZGVT + GZKPGZVT - No pieces sent across to other player

Actraiser (SNES 1991) Game Genie Codes

aka アクトレイザー (Japan 1990)

2264-6FD4 - Almost invincible in action sequences
D081-6DD8 - Start with 1/2 energy--1st game only
DD8B-D4D8 - Stop timer
FD86-D4A8 - Faster timer
9D86-D4A8 - Slower timer