Easy Rundown
When your opponent gets a runner on first base, wait till the runner sets on the base. When he sets throw the ball to third. The runner might try to go to second if so:
1. Throw the ball to second. He might get tagged out, he might be safe, or he might try to go back to first. If so run him back and get him out.
2. If he does not go to second throw the ball home. He will almost definitely go to second if he does repeat step one.

Small players
Enter "TOMTHUMB" at the cheat screen.

Run faster
Hold Z while running to run even faster.

Control pitching speed
Hold Z to increase or R to decrease the speed of a pitch.

Beach ball mode
Enter "BCHBLKTPTY" at the cheat screen.

Batter flies to the dugout after he's out
Enter "FLYAWAY" at the cheat screen.

Baseball trails
Enter "WLDWLDWST" at the cheat screen.

Blurred graphics
Enter "MYEYES" at the cheat screen.

Blackout mode
Enter "WTOTL" at the cheat screen.

Lizard team
Select an exhibition game at Kaufmann Stadium. When a batter's ball hits one of the "Win a Lizard" signs, his entire team will turn into lizards.

Super fastball
Hold A + C-Down after pitching a fast ball in an exhibition game. The computer batters will be unable to hit the pitch.

Stolen Base Every Time
You must be batting against a pitcher with the Wakefield or Nomo delivery type. When you get a man on first on second, get a big leadoff. Don't worry if he trys to pick you off, you'll make it back in time. When he doesn't try to pick you off, wait until he takes the step forward to begin his delivery. Now, quickly steal to second or third. He will not throw there and you will have plenty of time to get there. (NOTE: This trick works best in ROOKIE MODE, but you can still pull it off in Veteran and All-Star.