Trick-Taking in Black and White, Hidden Numbers

A trick game where you predict invisible numbers and work together to complete a task.

This is a cooperative trick-taking game. Each player plays one card from their hand of nine cards, and plays a total of nine times. You win if you can adjust the number of wins for everyone according to the theme card.

However, only half of the numbers are written on the cards. The numbers on cards that are upside down are hidden. Do you put out the cards with invisible numbers early, or do you narrow them down and then put them out? Use the cards with visible numbers and the cards with invisible numbers wisely to complete the task.