I Doubt It is a great game for risk takers and bluffers to practice their skills. I Doubt It is also known as Cheats.
The object is to be the first player to use all your cards. In this game Aces are lowest and equal to one.
The dealer shuffles the cards and deals them all out one at a time to the players. It does not mater if some players have more cards than others.
The players each pick up their cards and sort them by rank.
The player to the left of the dealer goes first by taking their Aces and lying them face down on the table or they lay down an ace and try to sneak in another card by claiming that it is an ace. When the cards are laid down the player calls out what they have laid down, or rather what they are pretending to lay down. If the player played an ace and a another card they would still say "two aces" in hopes of sneaking the other card past the other players.
The next player to the left plays twos or whatever they try to pass off as twos.
Play continues to the left with each player playing the next highest card until king is reached. After the king is played the cycle starts over with the ace card.
If during play you suspect that someone is not being truthful or bluffing simple say "I Doubt It".
If someone doubts you must show the cards you just played. If you are in fact bluffing you will have to pick up all the cards played so far and add them to your hand, but if you were telling the truth all the cards go to the person who doubted you.
Whoever ended up with the pile starts the next round with the next highest card.
In the event that multiple players doubt a player at the same time the player closest to the doubted players left goes first.
The player who successfully plays all their cards is the winner.
To make the game a bit easier have each player only play a single card with each turn.
As in all bluffing games being able to maintain a straight face is critical. Being able to hide any indications, such as noises or gestures, that you are bluffing will greatly increase your chances of success.
It is good when a player challenges
you when you are in fact telling the truth. Use your acting skills and pretend your bluffing when your really not.
Near the end of the game more players will be bluffing and getting caught at it. This would be the time to play honestly if possible.
If you are only holding high cards and are in need of some low cards it may be wise to challenge a player when the pile is still mostly low cards. Do not try this when the pile is high or you'll end up with more cards than you can handle.