Well, despite having only 6 IPs for tracks, I have to say that Sumo did a good job covering all the typical video game environments (island, canyon, sky, jungle, ice, city, casino, etc.). Shenmue and Crazy Taxi would probably be superfluous as JSRF already presents a daytime city. Maybe re-skin Shibuya with 80's hair band posters for that Shenmue feel... Space Channel 5, however, was a necessary track addition. It adds that futuristic retro spaceship feel that no other IP or track currently in the game offers. Image the Ulala and ChuChu Rocket missions that could have taken place at Spaceport 9 and in the asteroid field! Hell, space is a rather easy place to create. Black star field, some repurposed elements from the Superstars Tennis SC5 track and you've got yourself a track!