Tag wikis are now prominently shown on hover and when tagging a question -- all the more reason to at least write their excerpts down!
If you consider yourself knowledgeable about a game, please consider contributing tag wikis and excerpts. Stick close to our format for tag excerpts & wikis, and note that those with less than 20k rep will need their edits to be approved before going live.
5k Reviewers, please make sure you reject suggestions blatantly copy pasted from other sites...