There are various ways to play Texas Hold em jogo mario online online for free. Places such as Global Poker, PokerStars Play, and the World Series of Poker all offer free ways to play the game of holdem.
Such methods include shorting the pot, avoiding house fees, and peeking at other players' cards. It is very difficult to prove because when confronted, at least the first time, the cheat often calls the cheating an honest mistake.