NISS stands for Normal Inverse Scramble Switch. In FMC, you want as fewest moves as possible, and NISS helps by switching between normal scramble and inverse scramble and you can see which takes less moves to solve. Note that you can switch between normal and inverse scramble anytime in your solve.Quick question what in my river is NISS for FMC?
I didn't learn NISS yet, but I know how it works. I just forgot how to switch between normal and inverse scramble.