For challenge creator:
- Post a link to your substrate and make sure it works.
- Set gene pool to the cell types allowed so it can easily be viewed from within game
- Write in text allowed cell types, and any other rules, perhaps a certain number of a certain cell type and so on..
- Try to estimate the difficulty and write this. Clearly you should have finished the challenge yourself, otherwise state this very clearly.
- You can upload a poll along with your challenge too so people can vote on it's difficulty.
- Write if it's ok to write or upload the solution in the forum
- Write "highest" necessary cell type necessary to play challenge, everyone doesn't have access to all cell types.
- Don't post/upload solutions/hints unless this has been allowed by uploader.
- Discussing properties of substrate is fine unless uploader says so.
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Description: Challenge description, introductory text
Substrate: Link to the substrate
Objective (difficulty): Goal description
Max Cells inserted: Number
Cell Type allowed: Cell types (restrictions)
(optional) Additional Rules: Rule description
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Let me know below if something is missing or it's too much

I will attempt to move some threads here.