The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 25 (1 member)
- 4th of July Skins (3 members)
- 50 (1 member)
- Adventures (10 members)
- African skins (3 members)
- Agar.io (19 members)
- Agar.io Universe (1 member)
- Agar.io Wiki (1 member)
- Agar.io Youtubers (16 members)
- Agar.io online game (1 member)
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- Agario (8 members)
- Agario History (2 members)
- Agario game (1 member)
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- Agario play (1 member)
- Agario private server (5 members)
- Agario unblocked (3 members)
- Alien Skins (10 members)
- Ambiguous skins (4 members)
- Animal skins (79 members)
- Article Stubs (1 member)
- Article management templates (3 members)
- Article stubs (13 members)
- Asian skins (23 members)
- Autumn Skins (0 members)
- Autumn skins (5 members)
- Azerbaycan (1 member)
- Azertyyuii1230 (1 member)
- Bad Comments (23 members)
- Ball (1 member)
- Bayram (1 member)
- Bird Skins (6 members)
- Birthday Skins (1 member)
- Black Skins (5 members)
- Blog posts (83 members)
- Bots (3 members)
- Brazilian Skins (2 members)
- Browse (12 members)
- Browsee (1 member)
- Browser Extensions (2 members)
- Candidates for deletion (29 members)
- Candidates for speedy deletion (34 members)
- Candy Skins (1 member)