Why doesn't the SHPONGLE cheat for top gun combat zones for GameCube work?

The SHPONGLE cheat for "Top Gun: Combat Zones" on GameCube may not work due to several reasons, including potential region-locking issues, game version discrepancies, or incorrect input of the cheat code. Additionally, the cheat could have been removed or altered in different game releases, rendering it ineffective. It's also possible that the cheat requires specific conditions to be met within the game before it can be activated.