Half of each competition will be eliminated, but if it is odd, one lucky person can go directly to the next competition after drawing lots to decide the competition object.
( 12 1- 1)/2=60
(60+ 1- 1)/2=30
(30+ 1- 1)/2= 15
( 15+ 1)/2=8
8/2=4
4/2=2
2/2= 1
A ***7 games.