Older Cheats:
(last update - Dec 17 1999)
Press C-Up + C-Down at the Main Menu to display the cheat screen. The message "You have found the secret room. Press some buttons and see what happens" will appear to confirm the code entry. Then at the cheat screen, enter any of the following codes:
| Effect | Code |
| Big Heads (Away Team) | C-Up (x2), C-Down, C-Left, C-Right |
| Big Heads (Both Teams) | C-Up (x2), C-Down, C-Right, C-Down |
| Big Heads (Both Teams)* | C-Up (x2), C-Down, C-Right |
| Big Heads (Home Team) | C-Up (x2), C-Down |
| Bonus Teams | C-Up (x2), C-Down (x2), C-Up (x2), C-Down (x2) |
| Long Necks | C-Up (x2), C-Down, C-Up, C-Down |
| Small Players (Away Team) | C-Up, C-Right |
| Small Players (Both Teams) | C-Up, C-Right, C-Down |
| Small Players (Home Team) | C-Up, C-Down |
* Home Team gets bigger heads.
At the mode selection screen, highlight "Quick Play" or "Arcade Play" options and press C-Right + A. The Nintendo Gamers, Left Field Lefties, and Nintendo Plumbers teams will appear between the All-star teams and Pacific divisions.
At the team selection screen, press C-Up (x7). If you entered the code correctly, you will hear the sound of a bouncing ball. Then, press C-Down the indicated number of times to create a home team where every member is the same indicated player. To create a clone away team, press Z to display the team selection screen that features statistics before pressing C-Down.
| Player | Code |
| Kobe Bryant | C-Down (x3) |
| Ken Griffey Jr. C-Down (x4) |
| Random NBA player | C-Down (x5) |
| Minoru Arakawa (Nintendo) | C-Down (x10) |
| Tim Bechtel (Nintendo) | C-Down (x11) |
| Steve Bolender (Nintendo) | C-Down (x12) |
| John Brandwood (Left Field) | C-Down (x13) |
| David Bridgham (Nintendo) | C-Down (x14) |
| Scott Bush (Left Field) | C-Down (x15) |
| Marc Doyal (Nintendo) | C-Down (x16) |
| Mike Fukuda (Nintendo) | C-Down (x17) |
| Jeff Godfrey (Left Field) | C-Down (x18) |
| Ken Griffey Jr. (Homerun Hero) | C-Down (x19) |
| Roger Harrison (Nintendo) | C-Down (x20) |
| Chick Hearn (Voice of the Lakers) | C-Down (x21) |
| Robert Hemphill (Left Field) | C-Down (x22) |
| Jim Holdeman (Nintendo) | C-Down (x23) |
| Mike Knauer (Left Field) | C-Down (x24) |
| Kevin Kraus (Nintendo) | C-Down (x25) |
| Chris Lamb (Left Field) | C-Down (x26) |
| Michael Lamp (Left Field) | C-Down (x27) |
| Stu Lantz (Lakers Announcer) | C-Down (x28) |
| Howard Lincoln (Nintendo) | C-Down (x29) |
| Ken Lobb (Nintendo) | C-Down (x30) |
| James Maxwell (Left Field) | C-Down (x31) |
| Umrao Mayer (Left Field) | C-Down (x32) |
| Arnie Myers (Nintendo) | C-Down (x33) |
| Dan Owsen (Nintendo) | C-Down (x34) |
| Colin Palmer (Nintendo) | C-Down (x35) |
| Tom Prata (Nintendo) | C-Down (x36) |
| Ed Ridgeway (Nintendo) | C-Down (x37) |
| Henry Sterchi (Nintendo) | C-Down (x38) |
| Noah Stein (Left Field) | C-Down (x39) |
| Faran Thomason (Nintendo) | C-Down (x40) |
| Gail Tilden (Nintendo) | C-Down (x41) |
| Russell Truelove (Left Field) | C-Down (x42) |
| Erich Waas (Nintendo) | C-Down (x43) |
| Phil Watts (Left Field) | C-Down (x44) |
| Armond Williams (Nintendo) | C-Down (x45) |
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