If you forget to say "uno" during a game, you may have to draw more cards as a penalty.
If you forget to say "uno" during a game of Uno and another player notices, you may have to draw additional cards as a penalty.
If you forget to say "uno" during a game of Uno and someone else notices, you may have to draw two penalty cards as a consequence.
If you forget to say "uno" during a game, you must draw two cards.
When you forget to say "uno" during a game, you must draw two cards.
If you forget to say "uno" during a game, you must draw two cards as a penalty.
If you forget to say "Uno" during the game, you must draw two cards as a penalty.
If you forget to say "uno" during a game, you have to pick up two cards.
If you forget to say "uno" during a game, you must pick up two cards.
If you forget to say "uno" while playing the card game, you may have to draw more cards as a penalty.
If you forget to say "Uno" when you have one card left in a game of Uno, other players can challenge you. If you are caught, you must draw two more cards as a penalty.
If you forget to say "uno" when you have only one card left in a game of Uno, other players can challenge you. If caught, you must draw two more cards as a penalty.
Forgetting to say "check" in a game of chess does not have any specific consequences in the official rules of the game. It is not a required part of gameplay, but it is a common courtesy to alert your opponent when their king is in danger.