Quite a few differences in the Argentina version - suddenly the flaws in the UK version don't seem so bad.
Firstly, the main hosts are on the course and there is no third reporter - although someone off camera does do the interviews with the contestants before the qualifier - but you only see their hand holding the mic.
18 seem to start, with 12 through to the Sweeper. The big change then is there seems to be no third round - the final four from the Sweeper progress straight to the Wipeout Zone. The winner of the Sweeper gets a 30 second advantage in the Wipeout Zone.