Complex sentence: Unlike other Zero series Hard modes, Zero2 makes you use only the Proto Form, limiting all weapons to their base attacks, it's weird that the Charge Shot (S) is absent in it, as all other Hard Modes have it.
Split into simpler sentences: Unlike other Zero series Hard modes, Zero2 makes you use only the Proto Form, limiting all weapons to their base attacks. The one thing that deviates is that the Charge Shot (S) is absent in it, as all other Hard Modes have it.