Mario won his task to stay in the Big Brother house, becoming a full BB contestant as a result.
The Essex boy was able to convince fellow housemates he was not responsible for a series of mischievous stunts.
Mario's task had been to pretend a beach ball with nasty messages he'd written on had been thrown from outside, and to secretly chuck all their food in the pool. His final task was sabotaging the meal at a Hawaiian-themed party.
He would have been evicted if eight or more guessed he was the mole but only Corin and Ife picked him. The other 10 thought it was Sunshine.
Mario has become a favorite to win, as punter have placed more bets on him than all the rest put together, making him 5/1 with bookies Ladbrokes, from opening odds of 8/1. Steve remains 9/2 favourite.
Tagged in Big Brother