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Basic Summary

Unranked Jam accepted up to 5 Maps, Skins, Mob Skins, Texture Packs, Mods and Data Packs from participants.
Requires maps are downloadable.
Accepts texture pack resolution of 16x, 32x and 64x.
Accepts standard and 2x HD resolution skins.
Accepts all mob models excluding objects.

Read the about for more information.