Six levels, on the whole well done. The first two are variations on a theme... and they both make it a bit too easy to die a nasty flaming death for my taste. (I prefer my net deaths to be at the hands of my coplayers...) The others, as well, contain a bit too much nastiness for my taste (crusher platforms are present a lot). One level , however, works really, really well... Additive Light has a wonderful balance of tight space and confusing architecture. The others, too, are quite fun, if you don't have my aversion to non-human killers.