• Alternate picking cards from the left and right.
• If there is a sun card on the current side, you must play it and advance the sun one space.
• Otherwise choose any owl and move it to the next unoccupied space of the same color as the card, or into the nest if there is none.
• Get all six owls into the nest before the sun rises.

This interface doesn't implement game logic. Click on a sun space to move the sun, an owl and then a space to move an owl, and on a card to draw a new card in its place.