Hunter x Hunter (2011) - episode 34 - 02 Jun, 2012

Riehvalt and Gido hear of Killua's threat from Sadaso and talk about cheating in their matches to gain the upper hand. Killua interrupts them, demonstrating his speed and cold-blooded demeanor to scare them into playing fairly. After training tirelessly with Zushi and Wing, Gon and Killua defeat Riehvelt and Gido in their battles. Hisoka, impressed with Gon's progress, appears in Gon's way afterwards and invites him to be his next opponent, to which Gon agrees. (Source: Wikipedia) Heavens Arena arc: (8/10)