| CODE | KEY IN... | EFFECT... |
| 1 | OZSKPZVK | Infinite lives |
| 2 | AASPLAZA | Start with 1 life |
| 3 | IASPLAZA | Start with 6 lives |
| 4 | AASPLAZE | Start with 9 lives |
| 5 | SZKZGZSA | Infinite energy |
| 6 | TAXOIOGO | Start with half energy |
| 7 | AVVXLPSZ | No harm from any enemies, except super villains |
| 8 | OXSLEEPV + AUSLOEAZ | Always get maximum points for shooting super villains |
| 9 | TAOOYTGA | MegaMan mega-jump |
| CODE | KEY IN... | EFFECT... |
| 1 | SXUGTPVG | Infinite lives |
| 2 | SXXTPSSE | Infinite energy |
| 3 | TEKAIEGO | Start with half energy |
| 4 | PANALALA | Start with 1 life |
| 5 | TANALALA | Start with 6 lives |
| 6 | PANALALE | Start with 9 lives |
| 7 | LZVSSZYZ | Gives burst-fire from normal weapon |
| 8 | TANAOZGA | Power jumps |
| 9 | AANAOZGE | Super power jumps |
| 10 | APNAOZGA | Mega power jumps |
| 11 | GZKEYLAL | Maximum weapon energy on pick-up |
| 12 | PGEAKOPX | Moonwalking |
| CODE | KEY IN... | EFFECT... |
| 1 | aenkkaza | 1 life |
| 2 | ienkkaza | 6 lives |
| 3 | aenkkaze | 9 lives |
| 4 | PAOONPZA | 1 life after continue |
| 5 | IAOONPZA | 6 lives after continue |
| 6 | AAOONPZE | 9 lives after continue |
| 7 | aeegxlpa | Infinite lives |
| 8 | yeukotga | Mega-jumping MegaMan |
| 9 | asxstlgp | Longer slides |
| 10 | nnkialee | Speedy slides |
| 11 | gxvaaasa | Infinite energy |
| 12 | NYKGXSGK | Faster MegaMan | 13 | zakgnipa | Mega fast MegaMan |
| CODE | KEY IN... | EFFECT... |
| 1 | AAUKZIZA | Start with 1 life |
| 2 | IAUKZIZA | Start with 6 lives |
| 3 | AAUKZIZE | Start with 9 lives |
| 4 | SZUGUAVG | Infinite lives |
| 5 | GXNPZTVG | Infinite "energy" pods on pick-up |
| 6 | AEOAIEPA | Instant megablast! |
| 7 | YXEAIOZO | Longer sliding |
| 8 | ZOEAIOZP | Shorter sliding |
| 9 | GEOAGPZA | Faster sliding |
| 10 | ZANKPTPA + ZEVALLPA | Faster running |
| 11 | AAKEYPIE | MegaMan mega-jumping! |
| 12 | GXENESOO | Infinite weapon power | 13 | GXVEIPSA | Don't take damage from bad guys |
| CODE | KEY IN... | EFFECT... |
| 1 | GXSEYZSA | Infinite MegaMan energy |
| 2 | GXXAAIVG | Infinite lives |
| 3 | XAKSUTEA | Start with at least 2 energy tanks |
| 4 | VAKSUTEA | Start with at least 6 energy tanks |
| 5 | XASIOTEA | Start with at least 2 mega-tanks |
| 6 | VASIOTEA | Start with at least 6 mega-tanks |
| 7 | GXSEPZVG | Infinite mega-tanks on pick-up |
| 8 | GZSATPVG | Infinite energy tanks on pick-up |
| 9 | YEXETAIA + ONUELEUN | Super-jumping MegaMan |
| 10 | PEXETAIA + NNUELEUY | Mega-jumping MegaMan |
| 11 | OVNLZISV + OTKPYISV | Infinite energy for most weapons |
| 12 | PEVLLPGA | Starting weapons use less energy |
| CODE | KEY IN... | EFFECT... |
| 1 | AAUKVIZE | Start with 9 lives |
| 2 | IAUKVIZA | Start with 6 lives |
| 3 | AAUKVIZA | Start with 1 life |
| 4 | SXEEXTVG | Infinite lives--can sometimes die and go to another part of the game |
| 5 | GXEAKYST | Infinite energy--except fires, falling into pits and spikes still kill you |
| 6 | LOOEKGPP | Normal shots do more damage |
| 7 | TOKENGLP | Mega-shots do more damage |
| CODE | KEY IN... | EFFECT... |
| 1 | DBBE-446F | Start with 10 lives |
| 2 | D1BE-446F | Start with 7 lives |
| 3 | D0BE-446F | Start with 5 lives |
| 4 | DDBE-446F | Start with 1 life |
| 5 | C2B9-3404 | Infinite lives |
| 6 | D6BE-47AF | Start with less energy |
| 7 | 4DBE-47AF | Start with more energy |
| 8 | C2B9-1FF7 | Infinite energy |
| 9 | 6DB5-CD97 | Most enemies are defeated with one shot |
| 10 | 23BD-3F07 | Start with all weapons and all enemies defeated--EXCEPT SIGMA |
| 11 | C9B3-4769 | Infinite weapons once you have them |
| 12 | D08A-1FBC | Bogus jump | 13 | D58A-1FBC | Super jump | 14 | DB8A-1FBC | Mega-jump | 15 | DDB0-4FA1 | Disable weapon charging | 16 | DDB1-4F61 | Weapon charges to 1st power level faster |
| EFFECT | KEY IN... |
| Invincible | 8015E2AA 2D00 |
| Infinite Energy | 8015E282 2800 |
| Infinite Lives | 801C3370 0005 |
| Infinite Rush Energy | 801B2990 0027 |
| Infinite Bolts | 8016D2F0 0009 |
| Always Have Mega Ball | 801B1EB0 0001 |
| Infinite Mega Balls | 801B1EB2 2D00 |
| Always Have Flash Bomb | 801B1EB4 0001 |
| Infinite Flash Bombs | 801B1EB6 2D00 |
| Always Have Thunder Claw | 801B1EB8 0001 |
| Infinite Thunder Claws | 801B1EBA 2D00 |
| Always Have Ice Wave | 801B1EBC 0001 |
| Infinite Ice Waves | 801B1EBE 2D00 |
| Always Have Tornado Hold | 801B1EC0 0001 |
| Infinite Tornado Holds | 801B1EC2 2D00 |
| Always Have Water Balloon | 801B1EC4 0001 |
| Infinite Water Balloons | 801B1EC6 2D00 |
| Always Have Flame Sword | 801B1EC8 0001 |
| Infinite Flame Swords | 801B1ECA 2D00 |
| Always Have Homing Sniper | 801B1ECC 0001 |
| Infinite Homing Snipers | 801B1ECE 2D00 |
| Always Have Astro Crush | 801B1ED0 0001 |
| Infinite Astro Crushes | 801B1ED2 2D00 |
| EFFECT | KEY IN... |
| Joker Command | D00C0C26 ???? |
| Infinite Life | 800B521E 00C4 |
| Infinite Zenny | 800C1B2C 423F 800C1B2E 000F |
| Infinite Health Boat & Airship | 80100E02 2400 |
| Infinite Special Weapon Power | 800357FC D623 800D895E 2400 800D8B5E 2400 800D8BBE 2400 |
| Invincible Megaman | 300B52C0 0001 |
| Invisible Megaman | 300B52C1 001F |
| Time is Always 00:00 | 800C1B1C 0000 800C1B1E 0000 |
| Have All Normal Items | 800BE420 FFFF 800BE422 FFFF 800BE424 FFFF 800BE426 FFFF |
| Have All Special Items | 800BE41C FFFF 800BE41E FFFF |
| Have All Special Weapons | 800BE410 FFFF |
| Equipped Special Weapon Modifier [Note] | 300B5322 000? |
| Equipped Special Weapon Always Active Modifier [Note] | 300B5320 000? |
| Mega Buster Always Enabled | 300BE321 0001 |
| Cameleon Net Always Active | 800BBD96 06BB |
| Defense Shield Always Active | 800BBD94 031E |
| Mega Jump | D00B52CC 4000 800B51D2 FA00 |
| Slot 1 | 300B5600 00?? |
| Slot 2 | 300B5601 00?? |
| Slot 3 | 300B5602 00?? |
| Slot 1 | 800B5604 00?? |
| Slot 2 | 800B5606 00?? |
| Slot 3 | 800B5608 00?? |
| Slot 4 | 800B560A 00?? |
| Slot 5 | 800B560C 00?? |
| Slot 6 | 800B560E 00?? |
| Slot 7 | 800B5610 00?? |
| Slot 8 | 800B5612 00?? |
| Slot 9 | 800B5614 00?? |
| Slot 10 | 800B5616 00?? |
| Slot 11 | 800B5618 00?? |
| Slot 12 | 800B561A 00?? |
| Slot 13 | 800B561C 00?? |
| Slot 14 | 800B561E 00?? |
| Slot 15 | 800B5620 00?? |
| Slot 16 | 800B5622 00?? |
| 00 - Nothing |
| 01 - Blaster Unit Omega |
| 02 - Sniper Unit Omega |
| 03 - Laser |
| 04 - Sniper Range |
| 05 - Turbo Battery |
| 06 - Power Raiser Omega |
| 07 - Range Booster Omega |
| 08 - Turbo Charger Omega |
| 09 - Blast Unit |
| 0A - Sniper Unit |
| 0B - Power Raiser Alph |
| 0C - Range Booster Alpha |
| 0D - Turbo Charger Alph |
| 0E - Power Raiser |
| 0F - Range Booster |
| 10 - Turbo Chargerr |
| 11 - Buster Max |
| 12 - Power Stream |
| 13 - Blaster Unit R |
| 14 - Buster Unit Omega |
| 15 - Omni-Unit Omega |
| 16 - Auto Battery |
| 17 - Sniper Scope |
| 18 - Rapid Striker |
| 19 - Gatlin Gun |
| 1A - Omni-Unit |
| 1B - Power Blaster R |
| 1C - Power Blaster L |
| 1D - Machine Gun |
| 1E - Triple Access |
| 1F - Buster Unit |
| 20 - Rapid Fire |
| 21 - Helmet |
| 0 - Kick |
| 1 - Mega Buster |
| 2 - Machine Buster |
| 3 - Powered Buster |
| 4 - Drill Arm |
| 5 - Grenade Arm |
| 6 - Spread Buster |
| 7 - Vacuum Arm |
| 8 - Active Buster |
| 9 - Blade Arm |
| A - Grand Grenade |
| B - Splash Mine |
| C - Shield Arm |
| D - Shining Laser |