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.
Video games have come a long way since the days of Pong and Asteroids. Today many video games feature ultra-realistic high-definition graphics and complex gameplay. In addition, modern video games can be played online, allowing gamers to build large social communities that focus on specific video games and video game genres.