The following are known Action Replay Codes for Backyard Sports: Sandlot Sluggers on Nintendo DS (NDS).

Player Creation Codes

• 0 Points Remaining (Press Select + L)
  94000130 fdfb0000
  220bcefc 00000000
  d2000000 00000000
• 1 Points Remaining (Press Select + R)
  94000130 fefb0000
  220bcefc 00000001
  d2000000 00000000
• Max Power (Press L + R)
  94000130 fcff0000
  220bce5a 0000000a
  d2000000 00000000
• Max Pitch (Press L + R)
  94000130 fcff0000
  220bce5b 0000000a
  d2000000 00000000
• Max Fielding (Press L + R)
  94000130 fcff0000
  220bce5c 0000000a
  d2000000 00000000
• Max Speed (Press L + R)
  94000130 fcff0000
  220bce5d 0000000a
  d2000000 00000000