You can gain points for certain feats performed during a game. You can use these points to buy cards which unlock cheats, stadiums, jerseys, producers, and players. An easy way to get a lot of points is to throw a perfect game. This is worth 100 points. Switch controls every time the CPU is up at bat and intentionally strike out. This will get you points for 27 strikeouts, and for a perfect game. Repeat this as many times as needed to get an unlimited amount of points.
Extra points
To get more points in franchise mode to sign your free agents, during the off season either create a player and pick him up as a free agent or sign free agents and release them at the end of the season.
Control homerun replay
After hitting a homerun, a replay of it will be displayed. When you see your batter heading home from third base, press various buttons to see different camera angles.
Better hitting
As soon as the pitch is thrown hit Start and see the ball path to see if it is a ball or strike. Adjust your cursor accordingly.
Secret Stories
Start any game and do not press any buttons. A few minutes after the lineups and the starting pitcher are announced, Thom Brennaman will start telling stories about baseball.
Cheat menu
Press L at the controller selection screen to activate cheats that have been bought.
Taunt opponents
On your way home after hitting a homerun, press L, R, Black, White, B, X, or Y and your player will taunt the opposing team.
Perfect Game
If you want a perfect game, play both teams in two player. Deliberately strike out on purpose when each team is up at bat. Then at the bottom of the ninth, walk 4 batters and then you should receive 100 points for a perfect game.