With his gold-level badge, Han Wu could have ventured into the platinum-level training zones, but he chose not to.

Upon arriving in the City of Myriad Phenomena, Han Wu immediately headed to the Adventurer's Guild to inquire about the silver-level training zones and the types of monsters within them.

After gathering this information, Han Wu stocked up on enough food and began visiting each silver-level training zone.

This wasn't for leveling up, but to acquire more diamond-level titles.