, are hired professionals ranked from Grade 9 to Grade 1. "S2" could refer to "Season 2" content, where specific mechanics or character balances (like those for Color Fixers ) are adjusted.

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If you are instead referring to a technical or gaming guide (such as for ), "S2 V21" is a common notation for specific Creeper Farm builds. In that case, the "change" would involve swapping temporary blocks for gates to prevent water spills into the drop chute.