Help me explain how Mystery Bonus spells are working

[Toloriel]

For an Oracle mystery, how are bonus spells are to working? Does it add the spell to your list of known spells? Or does it allowing you to cast the spell whenever? What are the rules for this?

Thanks

[Thirdhorseman]

adds to spells known at the listed levels

[Azten]

In addition to your normal spells known and the bonus cure/inflict bonus spells

[Toloriel]

Thanks you I undertand.