The following are known Game Genie Codes for Mega Man 2 on Nintendo Entertainment System (NES).

• TEKAIEGO
  Start with half energy
• SXXTPSSE
  Infinite energy
• PANALALA
  Start with 1 life
• TANALALA
  Start with 6 lives
• PANALALE
  Start with 9 lives
• SXUGTPVG
  Infinite lives
• LZVSSZYZ
  Gives burst-fire for normal weapon
• TANAOZGA
  Power-Jump
• AANAOZGE
  Super-Jump
• APNAOZGA
  Mega-Jump
• GZKEYLAL
  Maximum weapon energy on pick-up
• PGEAKOPX
  Moon-Walking