The Gallic hero duo is back and has to assert itself against a new threat: Apparently the village druid Miraculix has switched sides and is now in the service of the Roman Empire. Ergo, Asterix, Obelix and his four-legged companion Idefix make their way to Las Vegum. In the Roman entertainment complex, the two friends clear up all sorts of enemies and, with the help of Roman secret agent Sam Schiffer, try to shed light on the alleged conspiracy.
On Nintendo's handheld you jump along predetermined paths through pseudo-3D levels, whereas the PSP version offers a real 3D adventure in which you can freely choose between the game's chapters right from the start.
In order to solve numerous switch puzzles, you use the individual strengths of the dissimilar team. While the little blonde can pass through narrow corridors, Obelix hits much harder and even smashes armored boxes. DS-exclusive, you complete small skill exercises using the stylus and light torches to pave the way forward. PSP Gauls, on the other hand, unlock doors by throwing dazed opponents at targets. However, on both handhelds, certain gates only open once you have defeated a predetermined number of enemies. At least on the PSP, you can use a variety of backfiring combos – some of which you even carry out in teamwork. On the DS you can only jump, punch and slide towards enemies. While Sony fans gather up to three colleagues and compete against each other in team death matches, DS Gauls only complete a handful of simple mini-games – but with only one game module.