Isolated Island is the very first Zone you go through in Knuckles' Chaotix and, naturally, the easiest one. As the first Zone in the game, it makes you go through various obstacles so you can learn the game's mechanics (though most of the obstacles here don't appear in any of the other Zones in the game for some reason).
Overall, I find Isolated Island to be one of the best levels in the game. It's not too maze-like (unlike some other levels in the game), it has great visuals and the lack of enemies means you can go as fast as you want without having to worry about running into everything.
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