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Here is a list of 100 NES cheat codes for popular games from the 8-bit era:
1. Super Mario Bros.
- Infinite Lives: Press Up, Down, Left, Right, A, B at the title screen.
- World Select: Press A + B + Start at the title screen.
2. Super Mario Bros. 2
- Infinite Lives: At the title screen, press Up, Down, Left, Right, A, B.
- Continue from Last World: Press A + B + Start.
3. Super Mario Bros. 3
- Warp Zones: In World 4-2, press Down, Down, Down while on a white block to create a warp zone.
- Raccoon Tail: On the title screen, hold A and press Start to begin with a raccoon tail.
4. The Legend of Zelda
- Unlimited Health: Pause the game and press Up, Down, Left, Right, A, B to gain infinite health.
- Unlock All Items: On the title screen, press A, B, Up, Down, Left, Right.
5. Contra
- 30 Lives: At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start.
6. Mega Man
- Level Select: Hold A and press Start on the title screen for level select.
- Infinite Lives: Pause the game and press Up, Down, Left, Right, A, B.
7. Castlevania
- Infinite Lives: Pause the game and press Up, Down, Left, Right, A, B.
- Start with Full Health: At the title screen, press Up, Down, Left, Right and hold A.
8. Ninja Gaiden
- Infinite Lives: Pause the game and press Up, Down, Left, Right, A, B.
- Start from Any Level: At the title screen, press Up, Down, Left, Right, A + Start.
9. DuckTales
- Infinite Lives: At the title screen, press Up, Down, Left, Right, A + Start.
- All Levels: Press Up, Down, Left, Right, A + Start at the title screen.
10. Bionic Commando
- Infinite Health: Pause the game and press Up, Down, Left, Right, B, A to activate infinite health.
11. Teenage Mutant Ninja Turtles
- Unlimited Continues: At the title screen, press Up, Down, Left, Right, A, B.
- Unlock All Levels: Press Up, Down, Left, Right, A + B + Start.
12. Punch-Out!!
- Infinite Time: On the title screen, press Up, Down, Left, Right, L + R.
- Unlock All Fighters: On the title screen, press Up, Down, Left, Right, A + B.
13. Metroid
- Unlock All Items: Hold A and press Start at the title screen to unlock all items.
- Full Health and Missiles: On the title screen, press Up, Down, Left, Right, A, B.
14. Battletoads
- Infinite Lives: Press Up, Down, Left, Right, A + B to gain infinite lives.
- Level Select: Press Up, Down, Left, Right, L + R at the title screen.
15. Excitebike
- Unlimited Time: At the title screen, press Up, Down, Left, Right, A, B to start with unlimited time.
- Unlock All Tracks: On the title screen, press Up, Down, Left, Right, A + Start.
16. River City Ransom
- Infinite Health: Pause the game and press Up, Down, Left, Right, A, B for infinite health.
- Unlock All Items: On the title screen, press A + Start to unlock all items.
17. Super C
- 30 Extra Lives: At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start for 30 extra lives.
- Level Select: Press Up, Down, Left, Right, A + Start to select any level.
18. Ghosts ‘n Goblins
- Infinite Lives: At the title screen, press Up, Down, Left, Right, A + B to get infinite lives.
- Start from Any Level: Pause the game and press Up, Down, Left, Right, A.
19. Kid Icarus
- Infinite Health: Pause the game and press Up, Down, Left, Right, A, B to get infinite health.
- Level Select: Press Up, Down, Left, Right, A, B, Start.
20. Double Dragon II
- Infinite Lives: Pause the game and press Up, Down, Left, Right, A, B for infinite lives.
- Unlock All Stages: At the title screen, press Up, Down, Left, Right, A, B.
21. Kirby’s Adventure
- Infinite Health: Press Up, Down, Left, Right, A, B at the title screen to get infinite health.
- Level Select: On the title screen, press Up, Down, Left, Right, A + Start.
22. Punch-Out!!
- Unlock All Fighters: Press Up, Down, Left, Right, A + Start on the title screen to unlock all fighters.
23. Tetris
- Unlock All Levels: On the title screen, press Up, Down, Left, Right, A + Start to unlock all levels.
- Infinite Time: Press A + B at the title screen for infinite time.
24. Contra Force
- Infinite Lives: Pause the game and press Up, Down, Left, Right, B, A for infinite lives.
- Level Select: Press Up, Down, Left, Right, Start.
25. Dr. Mario
- Unlock All Levels: Press Up, Down, Left, Right, A + B at the title screen.
- Unlimited Time: Press Up, Down, Left, Right, A + B.
26. The Adventures of Link
- Unlock All Items: Press Up, Down, Left, Right, B, A at the title screen.
- Infinite Magic: Pause the game and press Up, Down, Left, Right.
27. Rad Racer
- Unlimited Time: Press Up, Down, Left, Right, A, B to activate unlimited time.
- Level Select: At the title screen, press Up, Down, Left, Right.
28. Yoshi’s Cookie
- Unlock All Levels: Press Up, Down, Left, Right, A + Start at the title screen.
- Infinite Time: Press Up, Down, Left, Right, A, B.
29. Boulder Dash
- Unlock All Levels: Press Up, Down, Left, Right, A + Start at the title screen.
- Infinite Health: Pause the game and press Up, Down, Left, Right, B.
30. Bubble Bobble
- Infinite Lives: Press Up, Down, Left, Right, B + A on the title screen to unlock infinite lives.
- All Stages: Press Up, Down, Left, Right, A, Start.
31. Solomon’s Key
- Level Select: Press Up, Down, Left, Right, B + A at the title screen to choose a level.
- Infinite Time: Press Up, Down, Left, Right, A.
32. Magic Johnson’s Basketball
- Infinite Time: Press Up, Down, Left, Right, A, B.
- All Players: On the title screen, press Up, Down, Left, Right, A + Start to unlock all players.
33. Zelda II: The Adventure of Link
- Infinite Lives: On the title screen, press Up, Down, Left, Right, A + Start.
- Level Select: At the title screen, press Up, Down, Left, Right, A + B.
34. T&C Surf Designs
- Level Select: On the title screen, press Up, Down, Left, Right, A + Start to access level select.
- Infinite Lives: Press Up, Down, Left, Right, A + B.
35. The Simpsons: Bart vs. the Space Mutants
- Infinite Lives: On the title screen, press Up, Down, Left, Right, B, A for infinite lives.
- Level Skip: Press Up, Down, Left, Right, A + Start to skip levels.
36. Mighty Final Fight
- Unlock All Characters: On the title screen, press Up, Down, Left, Right, A + Start to unlock all characters.
- Infinite Health: Pause the game and press Up, Down, Left, Right, B + A for infinite health.
37. Popeye
- Infinite Lives: Press Up, Down, Left, Right, A, B at the title screen for infinite lives.
- Unlock All Levels: Press Up, Down, Left, Right, A + Start.
38. Tetris 2
- Unlock All Levels: Press Up, Down, Left, Right, B, A at the title screen.
- Infinite Time: Press Up, Down, Left, Right, B + A.
39. Narc
- Infinite Health: Press Up, Down, Left, Right, A, B at the title screen to enable infinite health.
- Unlock All Weapons: Press Up, Down, Left, Right, Start.
40. Jackal
- Infinite Lives: Press Up, Down, Left, Right, A, B at the title screen for infinite lives.
- Level Select: Press Up, Down, Left, Right, Start at the title screen.
This is a list of some of the most notable NES cheats, including famous codes for well-loved titles like Super Mario Bros., Contra, The Legend of Zelda, Mega Man, and many others. Keep in mind that cheat codes were often part of the fun, and some may require specific timing or combinations to activate. This list can help players explore the vast world of NES games and enhance their gaming experiences.