When Californian studio Naughty Dog veered off from the 3D platformer path and into GTA territory with its second Jak game, it made at least two significant mistakes. First, it thought buzzing around a cityscape in hovercars would be as much fun as hammering around streets in cars (it wasn't - by a yawning margin), and second, it failed to thoroughly playtest its work, resulting in a selection of missions so frustrating in their make-up only the masochistic could find them pleasurable.Both ...