A tournament is 12 events (or however many you pick), drawn from the library. Points for every place: 10, 8, 6, 5, 4, 3, 2, 1. Most points at the end is champion.
Not enough people? Add computer gladiators.
Every event tells you on your phone what to do: mash, hold on, steer, spin your finger in circles, pull back a slingshot, pick things, vote, record a mating call.
Duels: you both program four moves. SWING beats INSULT, INSULT beats BLOCK, BLOCK beats SWING. FRIENDSHIP is a gamble.
Lose a tooth and your insults lisp. A black eye and your aim wobbles. A broken arm, a bad leg, burns, a concussion (your controls flip now and then), a broken nose (the judges like you less).
It all stays until the tournament's over.