Risk of Rain 2 keys usually means keybinds, a Steam code, or a chest key. This page splits those searches so you land on the question you meant.
Searching Risk of Rain 2 keys usually means keyboard controls, a Steam product key, or an in-run chest key. This site does not publish redeem codes. The notes confirm 110+ stackable items, Artifacts that rewrite a run, and a ghostly green chest teased for an unreleased expansion. Use the sections below to match the question you actually have.
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.