Odds & Required Wins

In this game, the rule is: draws keep you in the same round, only wins advance you.
With an initial population of N, the theoretical number of wins required to become the final survivor is roughly ceil(log2(N)).

Stage Size Wins Required Victory Probability (Theory) Everyday Analogy
100 players 7 wins ≈ 1/128 (0.78%) Like winning a small neighborhood lottery
10,000 players 14 wins ≈ 1/16,384 (0.0061%) Like being chosen as the one winner in a full Tokyo Dome
1,000,000 players 20 wins ≈ 1/1,048,576 (0.000095%) Like winning a “one winner per year” campaign prize
8,000,000,000 (Global) 33 wins ≈ 1/8,589,934,592 Far less likely than winning the jackpot hundreds of times in a row
Much rarer than being struck by lightning many times over

* In actual play, draws make the number of rounds required even larger.
* Probabilities shown are theoretical values; actual results are not guaranteed.