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The reference section, in the open.

Nine pages on what each shot is actually for. No email, no account, no catch — read them, use them, send them to whoever needs them.

These are the pages a player looks things up in. They are written so a 12-year-old can read them alone, and they hold whether or not you ever buy anything.

And then the part that isn’t free.

Knowing what a slice serve does is the easy half. The hard half is recognising, mid-match, that it is happening to you — and deciding what to do about it.

That is what the 538 cards are for. Ten of them are free, with the full answer key on every one.

Read ten cards free