Hundreds of gamers hit the streets of Glasgow at the weekend in a big to escape 'zombies'

Around 950 people took part in 2.8 Hours Later, the smash-hit, adrenaline filled, cross-city urban chase game.

The unique street game involves participants partaking in an immersive narrative as they try and escape the 'zombies' out to get them. Decisions made by players along the way have repercussions on the route they take, the characters they meet and, ultimately, their chances of success or failure.

The 2014 version of the game, called 'Survival', follows a totally original story line, touching on many real-life themes and current affairs including terrorism, immigration, government surveillance and corruption, set in a terrifying world of filmic gore.

Players started in the relative safety of the 'asylum' and went on a mission to steal much needed supplies from the city. They were provided with a map to help them find the first checkpoint, where they unlocked the information required to find the next checkpoint, and so on, as they became immersed further in to the apocalyptic world of 2.8 Hours Later.

As players navigated their way around the route, they were chased by scores of the infected, meeting characters along the way who aided or inhibited their progress. Played by convincing actors, and in full costume and make-up, the zombies tried to 'catch' participants by marking them with invisible ink. In the 2014 version of the game players were also cautioned to be wary of the police and other government authorities who are trying to 'quarantine' civilians in order to stem the flow of infection.

The aim of the mission was for players to make it back to the asylum, with a bottle of drinking water and without being infected (marked with a UV pen) by the zombies. A UV light is used to scan for ink marks and all players infected were turned into zombies ahead of the 'zombie disco' - the after party - where everyone lives and parties in harmony.

The game, developed by award-winning game designers, Slingshot, is now in its fifth year, with the narrative for 2014 picking up where the 2013 story ended. Over 60,000 people have taken part in 2.8 Hours Later to date.

Having originally launched in Bristol, 2.8 Hours Later has since been played in cities across the UK including in Leeds, London, Manchester and Glasgow. Each game generates in the region of £50,000 for the local economy.

Simon Evans, who co-founded 2.8 Hours Later with his business partner Simon Johnson, said: "This was our third year in Glasgow and we feel it's been year the best yet."

He added: "It has been incredible to see players become totally immersed in the narrative, and they seemed to love the adrenaline kick they got from playing the game. It's a totally unique activity and a great way to have fun with your friends."