Here's the gameplay:
http://www.youtube.com/watch?v=_hUt211GJ-w&feature=youtu.be

The 1st mission of chapter 2. Enjoy!

Allen Wilson, a former special forces operator.He retired 10 years ago and returned to Las Venturas for vacation...Now,everything changed. Rich people wanted to be immortal so they hired one of the best scientist in the world to make for them a pill call ''AT''! But that when they swallow it they suddenly become a eating machine call ''zombies''. Now 2/3 people in the country turn into a zombies thanks to them. But soon after that, zombies become entertainment, too. Allen have to take part in a brutal game show, too! But he must because he needed money to save his best friend, who was bite by a zombie! He wanted to buy a cure call ''Zombrex'' which is the most expensive thing in the country. But after he won the game, things went wrong...

Topic:
http://www.gtaforums.com/index.php?showtopic=507434&hl=