Mashup games are always fun. Those built upon FourSquare have an extra layer of enjoyment, because they're tied to the real world. In the case of City Warfare, players use various water weaponry to soak other FourSquare users.
Twitch made API news this week with new endpoints and a developer invitation to discuss rate limit increases. The new endpoints allow developers to get and create clips, and retrieve the top games on Twitch. Twitch opened a dedicated email box specifically for fielding rate limit increase requests.