Imangi Studios’ popular Harbor Master game for the iPhone, iPod touch, and iPad has been updated with a couple of noteworthy features. Harbor Master version 2.1 adds Game Center support, the option to compete with friends on 10 leaderboards, and 38 new achievements. Imangi also added a new option to rewind once per game. That means you’ll be able to step back in the game after someone bumps into your on the subway and causes you to crash your tanker. We’ve been playing this game since it launched, and the goal is to navigate your ships into the appropriate harbor color across seven different maps. Version 2.1 is available immediately for $1.99 in the iTunes App Store.

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