"I Doubt It" or "Ultimate Doubt" is a fun card game that's great for children and adults to play together.
The one who discarded all the cards wins! Your 3 competitors will be chosen by roulette.
Discard a card in the order of A, 2, 3, 4,…10, J, Q, K. You can discard 4 cards at once. Card which can be removed should be brought high.
Cards which is not suitable in the situation can also be discarded as "fake". Press [Doubt] if you think someone is doing fake for "DOUBT!". If the card was actually a fake, the person has to have all the cards discarded. If it wasn't fake, you who said "Doubt!" has to do that.
If you don't call for "DOUBT!", press [Skip] to pass to the next player. Other players may also do "Doubt!"
One game is over when someone discard all the card, or 20th round is done. Scores from 4 games will be the final point.