TPG writes: "Today, we interview David about the geoDefense line of games, why they were such a huge success from a design standpoint, and we go in-depth about just what worked with the games to make them work so well. We also discuss the upcoming Imangi-Critical Thought collaboration geoSpark, which we have gotten our hands on, and discuss the gameplay and the design decisions that have the game shaping up to be one of the next big iPhone games."
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