The name of the game for Wild World is "refinement." Nearly every major flaw or shortcoming of the GameCube version appears to have been addressed in the DS remake. The tedium of typing out letters to your fellow townsfolk with the GC controller is handily negated here. Penning a missive via stylus is quick and easy. And the general pointlessness of sharing heartfelt correspondence with inane, babbling computer-controlled animal people has been addressed by the system's multiplayer component. Now you can communicate with real people. (Admittedly, they might be babbling idiots, too.)
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