To increase hitting power, insert "triplecrown" at the cheat code menu. If done correctly, the heart of your lineup (3rd, 4th, and 5th batters) will have increased hitting (50%). This will last for one game only.
To increase your team’s power for a single inning by 25%, put “mightymick” (minus the quotes) into the cheat code menu.
To unlock Mickey Mantle in free agency, enter “themick” in the cheat code menu.
To unlock all extras (except the Topps cheats), insert the code “Black Sox” at the cheat menu.