NBA Courtside 2: Featuring Kobe Bryant cheats and cheat codes for Nintendo 64

Enable cheat menu:
Hit C-Up + C-Down at the main menu. If the code is accepted you will 
see the message "You have found the secret room ..." message
Then, press the following button combination at the cheat screen:

Bonus teams: C-Up, C-Up, C-Down, C-Down, C-Up, C-Up, C-Down, C-Down.
Long necks: C-Up, C-Up, C-Down, C-Up, C-Down.
Tiny players for home team: C-Up, C-Down.
Tiny players for opponent team: C-Up, C-Right.
Tiny players for both teams: C-Up, C-Right, C-Down.
Giant heads for home team: C-Up, C-Up, C-Down.
Giant heads for away team: C-Up, C-Up, C-Down, C-Left, C-Right.
Giant heads for both teams: C-Up, C-Up, C-Down, C-Right, C-Down.
Giant heads for both teams but home team's heads bigger:
C-Up, C-Up, C-Down, C-Right.

Clone teams
Hit C-Up(7 times) at the team selection screen. If the code is accepted, 
you should hear a sound  of a bouncing ball. To create a home team, 
where every member is the same, hit C-Down the indicated number of 
times. To create a clone away team, hit Z to bring up the team 
selection screen that features statistics before pressing C-Down. 

Press C-Down(3 times) - Kobe Bryant
Press C-Down(4 times) - Ken Griffey Jr.
Press C-Down(5 times) - Random NBA player
Press C-Down(10 times) - Minoru Arakawa from Nintendo
Press C-Down(11 times) - Tim Bechtel from Nintendo
Press C-Down(12 times) - Steve Bolender from Nintendo
Press C-Down(13 times) - John Brandwood form Left Field Lefties
Press C-Down(14 times) - David Bridgham from Nintendo
Press C-Down(15 times) - Scott Bush form Left Field Lefties
Press C-Down(16 times) - Marc Doyal from Nintendo
Press C-Down(17 times) - Mike Fukuda from Nintendo
Press C-Down(18 times) - Jeff Godfrey form Left Field Lefties
Press C-Down(19 times) - Ken Griffey Jr. (Homerun Hero)
Press C-Down(20 times) - Roger Harrison from Nintendo
Press C-Down(21 times) - Chick Hearn (Voice of the Lakers)
Press C-Down(22 times) - Robert Hemphill form Left Field Lefties
Press C-Down(23 times) - Jim Holdeman from Nintendo
Press C-Down(24 times) - Mike Knauer form Left Field Lefties
Press C-Down(25 times) - Kevin Kraus from Nintendo
Press C-Down(26 times) - Chris Lamb form Left Field Lefties
Press C-Down(27 times) - Michael Lamp form Left Field Lefties
Press C-Down(28 times) - Stu Lantz (Lakers Announcer)
Press C-Down(29 times) - Howard Lincoln from Nintendo
Press C-Down(30 times) - Ken Lobb from Nintendo
Press C-Down(31 times) - James Maxwell form Left Field Lefties
Press C-Down(32 times) - Umrao Mayer form Left Field Lefties
Press C-Down(33 times) - Arnie Myers from Nintendo
Press C-Down(34 times) - Dan Owsen from Nintendo
Press C-Down(35 times) - Colin Palmer from Nintendo
Press C-Down(36 times) - Tom Prata from Nintendo
Press C-Down(37 times) - Ed Ridgeway from Nintendo
Press C-Down(38 times) - Henry Sterchi from Nintendo
Press C-Down(39 times) - Noah Stein form Left Field Lefties
Press C-Down(40 times) - Faran Thomason from Nintendo
Press C-Down(41 times) - Gail Tilden from Nintendo
Press C-Down(42 times) - Russell Truelove form Left Field Lefties
Press C-Down(43 times) - Erich Waas from Nintendo
Press C-Down(44 times) - Phil Watts form Left Field Lefties
Press C-Down(45 times) - Armond Williams from Nintendo

Unlock Nintendo Gamers, Left Field Lefties, and Nintendo Plumbers teams:
Highlight the "Arcade Play" or "Quick Play" options at the mode 
selection screen, then hit C-Right + A buttons. If the code is 
accepted, you should hear a sound. The bonus teams will appear 
between the All-Star and Pacific division teams.