OK hmmm...
Negatives
My death- 1%
Others Win-30%
No exit- 50% of 69% (100%-31%) = 34.5 % where 100% is i live.
My probability of solving the puzzle in 30 s= 0.0001
So 99.99999% sureshot death
.....
Positive is only 20% if others die.....
Yikes no way im opening this goddamned door!