Speaking to The Eurogamer TV Show at the THQ Gamer's Day in San Francisco, 2XL's Robb Rinard explained that dirt-racer Baja has a track over 300 miles long.
"It's actually honest to goodness 300 miles of driving through never-repeating terrain," said Robb. "You never seen a game where you can drive - A to B - and never touch the same piece of terrain twice."
"It's our biggest technical achievement," he added. "It took us three years to pull this off."
Baja will be out for 360 and PS3 in the autumn.
By Mike Bowden