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As you get older it all starts to blend :) Would have actually been more like 2010 [0] as I remember the iPhone 4 was the next target [1] and my job was to get all the DSP running on it. But you're absolutely right, the idea of GPS games is way, way older. Some of the team then were into "geocashing" sort of games and that's what inspired the musical zombies thing. IIRC they didn't all use "smartphones" either because not all models had GPS then.

[0] https://en.wikipedia.org/wiki/RjDj [1] https://www.iphonelife.com/content/evolution-iphone-every-mo...