The gamer unfamiliar with Metal Slug may have great difficulty playing though the game anyway, but exploring the levels as well may cause them to simply give up. On more than one occasion I felt my thumb wearing down as I searched the incredibly maze-like Mission three. Because Metal Slug is a difficult game when you’re just marching through, shooting all in your path, it becomes nearly impossible as a game of exploration. This also adds to the game’s difficulty as all enemies reappear once you’re away from a set position. Now the game positively encourages you to explore the gargantuan levels in search for cards and hidden secrets. To cater for Metal Slug’s new found sense of exploration the screen now scrolls backwards Usually on the Metal Slug games you can’t backtrack. The addition of the card mode certainly adds some depth that many gamers had found absent in the previous Metal Slug games and provides an incentive to re-play through the earlier levels before trying to tackle the more difficult later stages. You’ll also have to avoid dying otherwise you’ll lose all of your hard earned cards. If you want all of the upgrades you’ll have to search each of the five missions with the finest eye for detail. The cards can be found throughout the game and range from simple things like the various health cards to the upgrades for the excellent special weapons. This isn’t to say that Metal Slug has gone all Yu-Gi-Oh, but rather there are now cards that can be collected to give your player special features or can simply be viewed in a gallery. The game also features a new Card Collecting feature.

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