Ken Griffey Jr.'s Slugfest Cheats

Exploding batter
While in the batter's box, quickly press Right, Left, Down, Right, Left, Up, Right, Left, Down. Then your batter will explode and reappear after the next pitch.

View fireworks
Select exhibition mode. Then at the stadium selection screen, press Z to enter "View Stadium" mode. Then, press R + Z to shoot fireworks near the home plate section of the stadium.

Flying outfielder
Wait until a pop fly to the outfield is hit by your opponent. Allow the ball to drop, then pick it up. Hold Z and press C-Up to run into the infield with the ball. Then, press C-Right, C-Up, C-Left, C-Down, C-Left, C-Up, C-Down, C-Right, C-Up, C-Left, C-Down to throw the ball to various bases. If you entered the code correctly, the crowd will boo. Then, intentionally ignore the next ball that is hit into the outfield, and repeatedly tap A or B to fly.