The Grand Slam Burger is a food that you are able to buy at McSticks(at the 3rd island).

The burger gives you +100 hp and +2 strength.

You are able to give the Grand Slam to Mike on the 2nd island, which will allow you to get a ladder. Use the ladder to help the old woman next to Mobster Towers get her cat and she will give you a rare Trophemon.

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