Multi-man Sparring
One aspect of Kyokushin's grading system is requiring upper-belt candidates to fight with multiple opponents in succession with little rest in between each opponent. Also, the upper-belt candidate is expected to continue fighting even if injured in earlier matches or bouts. This method is designed to test the "fighting spirit," as well as the application of the technical knowledge that they've learned through (usually) years of studying the art. A favorable win to loss ratio is not necessarily required of the candidate (in most cases), just the ability to continue fighting until the test is over.

In addition to requiring multi-opponent sparring for upper-belt tests, a special tradition of Kyokushin has been the 50- and 100- man fight. The 100-man fight was designed as a special test for advanced practitioners of the art. In these extreme examples of multi-man fight, the subject of the test fights 50 to 100 opponents (depending on the test) in rapid succession, usually two-minute bouts separated by one-minute rest periods. The subject has to "win" (i.e., not get knocked-out) in at least 50-percent of the bouts in order to be deemed as passing the test. One example of someone who successfully completed the 100-man fight is Miyuki Miura. Reportedly, only 16 people have successfully completed the 100-man fight and 20- the 50-man fight. Masutatsu Oyama is reported to have completed a 300-man fight over 3 days.

I found this on Wikipedia. Explains the value of what I went through on the 25th...