Quantum Suicide - Part 2 The First Game (Make 10)
There are 2 ways to win this game and one to lose it. My strategy holds water here, and I will explain the math below.
The breakdown is as follows for the numbers:
Captain - 9
Yoshiki - 1
Shizuka - 2
Katashi - 3
Melody - 10
Nikolas - 6
Beatrix - 7
Sora - 8
Vladimir - 4
Shizuka and Katashi could be reversed, and Nikolas and Beatrix could be reversed. We do get information on the Captain and Yoshiki to identify them.
Since anything over 10 has 10 taken away from it, we can see that Nikolas and Beatrix will have 3 (13), meaning one of them dies if everyone else pairs up and we do nothing. Sora makes the sacrifice for herself and Vladimir here, since she combining with him would give them 2 (12), making them the lowest. Her and Vladimir doing nothing means one of the twins dies. Essentially, our best strategy in the game is to do literally nothing since there is no guarantee that people with complementary numbers will even group up (twins with Katashi/Shizuka or Sora) and we are guaranteed to have a higher number by default than almost half of the other players. So in the event you're wondering why I did what I did, that is why.
Luckily, the next game is less math intensive, but does have logic going for it.