Everyone's favourite boy genius makes a return to the Game Boy Advance in this latest 3D handheld adventure. This time around there's a new guy in town who's up to no good and looks remarkably like our hero. Remember the episode of Knight Rider when Michael Knight's evil twin Garth showed up causing trouble? You get the picture.
The story kicks off with Jimmy and his class wandering through the Retroville Museum attempting to listen to Miss Fowler drone on about useless artefacts. Suddenly, there's a puff of smoke and he finds himself in another dimension staring at himself! But we all know it isn't him, don't we? Jimmy is subsequently kidnapped and held captive in an evil parallel dimension, while the nasty Negatron takes his place in Retroville. With his new black flurp recipe, he plans to place Retroville under a spell so he can get on with his plan to take over the world. Once again it's a techno-filled adventure as Jimmy tries to rescue Retroville, stop the evil alter ego from wreaking anymore havoc and restore order to the Real World.
Play takes the form of a 3D-platform adventure, as Jimmy attempts to fulfil his quest and outwit the evil Negatron across 11 hazardous levels. Luckily, a healthy collection of gadgets is at our hero's disposal, including the shrink ray, the robot-disassembling ray, the dimension jump ray, the rocket ship and, of course, Jimmy's robot dog Goddard.
The new dimensional twist gives the game a bit more depth than the previous instalment of the series, offering a fair few hours of play to even the most hardcore GBA players. There are also a number of multiplayer games that make use of the host machine's link-up capability, thus adding a little more variety to the proceedings.