No idea, it's not insanely difficult stuff but it does require skill as you will have to use tori and uke and do specific moves and a specific time.
Let me give you the idea, it's a bit hard to explain.
So the first video is a game that has just begun, tori and uke are staring each other down while a narrative goes on about how these two are destined to fight or what not. The viewer is then given an option to choose a opener from 4 different openers (diverse but good ones) and after choosing a opener, it will go to another video where that opener is used and uke reacts with it. You are then given a situation to choose between a possible 2 moves and each one changes the outcome of the match. So replays will multiply on the way down the fights.
So just some basic math means
1 - 4 - 8 - 16 - 32 - 64
So in total 125 replays (the first being the one where tori and uke havent moved yet).
Do you understand?