Castle Combo

No — you may spend 1 (and only one) Key on your turn to either move the Messenger to the other location or discard and redraw the three cards at the Messenger's location (page 6).

No — any discount printed on the card you just purchase does not apply to that purchase; it only applies to future purchases (page 7).

No — a face-down card provides no ability, no end-game points, and no printed information; instead you immediately gain 6 Gold and 2 Keys as compensation (page 7).

Every card after your first must be placed orthogonally adjacent to at least one card in your tableau, and you may never add a fourth row or fourth column — your tableau must end up as a 3×3 grid (page 8).

You move the Messenger only if you either spend a Key to move it or you buy a card that has a Messenger icon printed in its banner; taking a card face-down or buying a card without the Messenger icon does not move it (page 6 and page 9).

Leftover Gold is worth points only if placed on Purse cards at game end; otherwise Gold not stored on purses is worth no points but is used as the tiebreaker (page 10).