Many examples in Italy, writers here seem to put a lot of effort into the bonus round.
L'Eredità (now in Season 24) became a staple only when the Guillotine bonus round was introduced.
Avanti un Altro!'s front game is pretty much a comedy show with some questions mixed in, but the bonus round has been imitated on YouTube (21 Questions Wrong).
And the most recent example is the "triple bonus round" (3 puzzles in 60 seconds) on Wheel of Fortune, which is often the most watched quarter hour in the country.