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If you have an idea for a challenge, feel free to post it here, or if you want to challenge specific member, make sure you TAG him and challenge him on a duel in modeling, rendering, texturing etc.
When making topic about challenge, or if you challenge specific member, please make sure you do it in a proper way.
At least try to include some info regarding challenge, or some background story about the challenge. Be polite, humble and play fair.