Risk of Rain 2 keys can mean loot keys, keybinds, or Steam codes. The source file does not define a Key item, so this page stays conservative and flags gaps.
Searching Risk of Rain 2 keys can mean three different things: an in-run lockpick item, keyboard binds, or a Steam product key. The source file has no official Key / Rusted Key / Keychain writeup, no bind table, and no publishable redeem codes. This page will not invent chest math.
This wiki has no codes sidebar. Anything that teaches you to buy accounts, paste CD keys, or use a trainer is out of scope.
Nearby facts we can confirm
The item system has 110+ stackable pickups. Some interactables rewrite a run (Artifacts; Hallowed Concepts teasers mention a Gong and Hex holders). "Key" may be community slang for one of those, but the source never writes it as its own article. Hallowed Concepts also teases a ghostly green chest. That is unreleased and cannot be back-ported into a current Key item.
Binds only show up in a Seekers diary as "send feedback on Discord." There is no WASD chart and no "keyboard not working" fix in the source.
If you are stuck on a door, separate base-game, void side path, and DLC stages. Those lock rules are unverified. Steam activation issues do not belong on a guide page.