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" confirms correct entry.)

Enable Cheat mode and press C-Up, C-Down at the cheat screen.

Enable Cheat mode and press C-Up, C-Right at the cheat screen.

Enable Cheat mode and press C-Up (x2), C-Down at the cheat screen.

Enable Cheat mode and press C-Up (x2), C-Down, C-Left, C-Right at the cheat screen.

Enable Cheat mode and press C-Up (x2), C-Down, C-Up, C-Down at the cheat screen.

Enable Cheat mode and press C-Up (x2), C-Down, C-Right at the cheat screen.

Highlight "Quick Play" or "Arcade Play" options at the mode selection screen, then press C-Right + A. The Nintendo Gamers, Left Field Lefties, and Nintendo Plumbers teams will appear between the All-star teams and Pacific division.

Enable Cheat mode and press C-Up (x2), C-Down (x2), C-Up (x2), C-Down (x2) at the cheat screen.

Press C-Up (x7) at the team selection screen. (The sound of a bouncing ball confirms correct entry.) Press C-Down the indicated number of times to create a home team. To create an away team, press Z to display team 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 (Lakers commentator)    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)

Enable Cheat mode and press C-Up (x2), C-Down, C-Right, C-Down at the cheat screen.

Enable Cheat mode and press C-Up, C-Right, C-Down at the cheat screen.

If you keep fouling the same person he will become bloody and injured at the free throw line.