The HERO World Tour is a game mode in Best Fiends meant for the best of the best!
It unlocks once you complete the last World Map level of the game.
When new levels are added, the HERO World Tour is moved to the end of the currently available World Map levels.
Even if you did not finish the HERO World Tour levels on your first try in the last update, you can continue from where you left off once the mode unlocks again on completing the last World Map level. Take a tour across Minutia and show the slugs what a Hero you are!