Heavens Arena

The Heavens Arena (天空闘技場 Tenkū Tōgijō​) is the world's most popular battle site. It is on the same continent as the Republic of Padokia, Killua's country, but is located in the eastern part of the continent, opposite of where the Republic of Padokia is.

Overview
The fourth-tallest building in the world, the Heavens Arena stands 3,250 feet tall and has 251 floors. Inside, thousands of martial artists compete daily in order to advance to higher floors. Competitors are allowed to fight and defeat their opponent using any means, but weapons are not allowed on the first 199 floors. One is given prize money for advancing on each of the 199 floors; after reaching the 100th floor, competitors get their own private room.

The 200th Floor
The floors above the 200th offer no prize money, but glory. Weapons are allowed to be used after reaching the 200th floor. One has 90 days to prepare for any fight, though it's possible to fight everyday if wanted. Losing four matches results in disqualification, while winning ten matches results in being awarded the title of Floor Master. The 21 highest ranked competitors are called Floor Masters because they're given their own floor between the 230th and 250th floors. The 251st floor of Heavens Arena holds a biennial tournament called the Battle Olympia; the victor is allowed to live on the 251st floor in an exclusive penthouse.

All of the fighters from the 200th floor and above use Nen exclusively. If one reaches the 200th floor without knowing how to use Nen, many fighters take it upon themselves to "initiate" the uninitiated by attacking them with Nen. Those "initiated" typically suffer severe injury, if not death. Sadaso, Gido, and Riehlvelt are all Heavens Arena fighters who were "initiated" and suffered permanent disability as a result.

Employees
Heaven's Arena have many employees ranging from referees, fight commentators, receptionist, guides, and elevator operators. All of them wears a uniform with the Heaven's Arena logo which is an emblem of a closed fist, the uniform is the same for both male and female employees. In the 1999 anime, a lift woman is shown to use Nen upon being angered by Killua.