Seven surfaces. Each one is a route you can open.

This list used to have thirty-six entries. Seven of those were study techniques with a page each, seven more were features that had never been built, and two credited an algorithm this product removed. What is left is the software.

• Lessons/odyssey

  The Odyssey

  A path through your specification, built around what you cannot do yet.

• Spaced retrieval/vault

  The Vault

  Your decks, and the dates they come back on.

• Exams/lab

  The Lab

  A real paper, in your board's format, marked against its scheme.

• The arrival/dashboard

  Tonight's move

  One decision, made for you, that you can disagree with.

• The record/forge

  The Forge

  A standing record of what you have done, which never expires.

• Evidence/proof

  The proof

  Our past predictions, checked against what actually happened.

• Safety-gated/arena

  The Arena

  Private study rooms are built. The safety gate is not open yet.

A sentence in this product that states a fact about what it does has to name the module that makes it true, and that module may not be a component. Chrome asserting a capability, backed by more chrome, is how a button that promised an opponent — and issued no request at all — shipped to a live screen.