Click the player who comes up with a word that matches both cards' criteria the quickest. This gives them a point.
Click the player a second time when their button is grayed out to confirm the point.
If a player is confident there is no right answer to the combination of cards, that player may shout "Papercut!"
If a player says "Papercut!" they are allocated a point.
A player can correct another player before the point is confirmed. This can be due to finding an answer for a question the first player thought was impossible, or due to calling out a bogus answer (even by saying "Papercut!" to declare the combination impossible).
If you as the referee think the correction was accurate, you can click another player while the first player is grayed out, to transfer the point to them. This transfers their previous point, too (which makes saying "Papercut!" a risk unless you're super confident).