Pixies

Choose which of the two cards to keep faceup; flip the other facedown and tuck it underneath, leaving it partly visible. If the faceup card is already validated, instead place the new card facedown on any empty space. (Rulebook, p. 1)

A faceup card placed over a facedown card is validated and scores its number, but you can’t play any more cards in your area for that round. (Rulebook, p. 1)

A round ends after a turn when a player has filled all 9 spaces, whether the cards are faceup or facedown. Facedown cards don’t score; only validated cards score their number. (Rulebook, p. 1)

Yes. All faceup cards count for symbol effects and for your largest color zone, whether validated or not. (Rulebook, p. 1)

No. A color zone needs at least 2 same-color cards touching along a side; diagonals don’t count. Only your largest zone scores, at 2, 3, or 4 points per card in rounds 1, 2, and 3, respectively. (Rulebook, p. 1)

Reveal 4 cards, then players alternate choosing and placing cards until all 4 are taken, so each player plays twice per turn. If one player fills their area before the other has taken the same number of turns, the other player still places one more card before the round ends. (Rulebook, p. 1)