Robert Pattinson and Kristen Stewart have become avid fans of playing board games.

The couple host "game nights" on the set of their new movie 'The Twilight Saga: Breaking Dawn' challenging each other to games of family favourites including chess, Monopoly and Scrabble.

The competitive duo - who play lovers in the hit vampire series - have also invited co-stars Taylor Lautner and Ashley Greene to join them to beat the boredom during filming breaks.

But Robert, 24, and Kristen, 21, have become so obsessed with winning The Games have sometimes ended in rows.

A source told Britain's The Sun newspaper: "Rob and Kristen have hours to burn on set and have got massively into board games.

"It gets competitive. There have been tantrums over snakes and ladders."

Kristen's enthusiasm for board games will come as no surprise to Robert who has admitted he fell for the star because she is so down-to-earth.

The heartthrob actor - who stars as vampire Edward Cullen opposite Kristen, who plays Bella Swan in the franchise - has praised her for being a "real woman".

Robert, who has never confirmed they are dating, said: "What I especially like about her is that she's like me, not dizzy from fans and press attention. She stays true to herself and very smart for her age."