Ball Test

The Ball is a sphere the size of a person which is used for tests.

Test
To pass the test, the regular must beat or dodge the keeper such as White Steel Eel and pop the Ball.

In [http://towerofgod.wikia.com/wiki/Ch._1:_1F_-_Headon%27s_Floor_(1) Ch. 1] Baam is given a Ball test by Headon (the First Floor Guardian). In this test the ball's keeper is a White Steel Eel which is in its breeding season and therefore have not been eating in a month, hence it is very hungry. Both the ball and eel is placed in a area with dense shinsoo. It is noted by Yuri Zahard that the difficulty of the test is to high for a low floor test and that it would be more fitting for 20th floor or higher.

Headon argues that the difficulty is fitting since Baam is a Irregular, but that he will allow for the rules to be bend a bit, and he will accept for Yuri to lend the Black March to Baam.

Other use
An Observer is a modified Ball used by Scouts. They collect visual data and pass the information to Light Bearers, who in turn analyze these data and coordinate their own team accordingly. Usually, a scout can control several observers at once.