Sixcess is a special skin released to celebrate the birthday of agar.io. It could be acquired for free in late July 2021.
Sixcess could be acquired in the Skins Shop under the 'Free' tab. It was available for a limited time and there may be few opportunities to acquire it again.
Details of this offer can vary depending on location, platform or time.
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Sixcess - Full Size
Sixcess - Skins Shop