All-Star Baseball'99
Alien Abductors
At the "ENTER CHEATS" screen enter the cheat code of "ATEMYBUIK". This will now enable an alien themed stadium called Alienapolis at the bottom of the stadium select list.
When you play on this field the 2nd team (or 2nd player in Home Run Derby) will be aliens on a team called the "Abductors". The players remain the same except for their appearance.
 Alien Abductors
 Beachball Baseballs
 Big Bodies, Heads,
 & Bats
 Fat or Skinny Players
 Paper Players
 Smoke Trail
Beachball Baseballs
Enter BBNSTRDS at the cheat menu and your baseball will be beachball sized.

Big Bodies,Big Heads,Big Bats
To access this code, go to the "Enter Cheat" menu and type GOTHELIUM. Go into the game and the players body parts and bats should be enlarged.

Fat or Skinny Players
For fat or skinny players, enter ABBTNCSTLO in the cheat code screen.

Paper Players
To access this cheat, go into the Cheat Menu and type "prppaplyr". Go into the game and the players should be as flat as paper!

Smoke Trail
Enter GRTBLSFDST at the cheat menu to see a smoke trail from the ball.
Credit Goes To: IGN 64