Two Canadian gamers have begun an attempt at the Guinness World Records title for 'Longest videogames marathon' - a record which has stood unchallenged for over a year.

Christopher Gloyd and Timothy Bell have previously held the title for 'Longest marathon on a first-person shooter' following a 45-hour session on Halo: Reach.

However they will need to more than double that if they hope to beat the mark set by the current holders.

Belgians Tony Desmet, Jesse Rebmann and Jeffrey Gamon, were the last men standing in a 109-hour Assassin's Creed marathon in December 2010.

Christopher and Tim will be playing the Resistance trilogy on PlayStation 3 for their attempt and have received support from the game's publisher, Sony, for the challenge.

A live stream of the attempt, which began at at 15h00 GMT, can be watched in the player below.

If the challengers are successful, they will finish some time on Friday.

The attempt will be considered for inclusion in the Guinness World Records 2013 Gamer's Edition.