I have not tried the scalextric app for a while now, as the recent upgrade meant it no longer works on my tablet. (Not scalextric's problem, it's an old tablet and I was lucky it worked as long as it did) I run Magic Arc from my Laptop (Magic has a version for windows alongside Android and iOS, come on Scalextric, give me a windows version) The most recent version of Magic has ironed out a few bugs and I've been happily racing against 2 pace cars. They do not pit, nor do they change lanes, but when you have to do both, it becomes a real challenge. The difficulty can be upped by increasing tire wear / fuel use on a per car basis, or in general for all cars. You can have all 6 cars as pace cars on Magic, and this is cool for demo vids, but for fun racing, As Gorp says any more than 2 pace cars (one per lane) and you just end up with a pace car train after a few laps, which may as well just be 1 car.