Gauntlet (NES 1985) Game Genie Codes

OTXSSYSV - no damage from monsters
OTXSSYSV + ZAXSVYAA - less damage from monsters
GGEEEE - walk through walls
ZLVVVIGT - weaker poison
EGVVVIGV - stronger poison
IAUTEUZA - pick up 5 super shots
GPUTEUZA - pick up 20 super shots
AYETVUGU - longer invincibility
LPETVUGU - shorter invincibility
ANNTUXGU - longer repulsion
LONTUXGU - shorter repulsion
AYOTKUGU - longer invisibility
LPOTKUGU - shorter invisibility

Wizards and Warriors (NES 1987) Cheat

- Unlimited Gems
Use the red key to enter the red door on level two. Move all the way up and break the gem block to collect a total of five gems. Move left and fall down to the bottom of the level. Return to the top and repeat this procedure to collect an unlimited number of gems.

Shadowrun (SEGA 1994) Cheat Code - Debug Menu

Debug Menu:
At the title screen hit A, B, B, A, C, A, B. Load the game and bring up your pocket secretary. Below the Save/Load Game option, you can select an invisible menu item. Then choose one of the below codes to get the goods

NUYEN - 250,000 nuyen
SPELLS - All available spells
TEST DECK - Best deck with all programs
PICK SYSTEM - Pick any mainframe
HEAL ALL - Heals your characters
+10 KARMA - 10 Karma points
CONTACTS - All available contacts
WALK FAST - Walk fast

If you want to do it again, just save and reset. Enter the code again and load your game and repeat the process.

Lode Runner (NES 1983) Game Genie Codes

GZNGYIVG - Infinite lives
PASKLTIA - Start with 1 life
ZASKLTIE - Start with 10 lives
APOIGPAL - Moonwalk!
GAUGVGYA + AAKGEGGA - Heavy gravity
GXOKIGEY + GXOGTGEY + GZNGLGEY - Become invincible