Namco Bandai is developing a Hunter X Hunter video game for PSP and all of the characters in the game have a "tension gauge." This meter fills up when Gon or whoever you’re playing takes damage. When its full you can unleash a powerful special attack.
You might want to save your tension gauge for Hisoka, Jump reports he’s one of the story mode bosses in Hunter X Hunter Wonder Adventure.
Hunter X Hunter Wonder Adventure is slated for release on September 20. Reserve the game in Japan and you’ll get a Wonder Hunter license card with codes for a Rookie Hunter custom theme and a downloadable costume.