Verbatim (a media storage company based in Japan) had an online game as promotion for their products called "Senshuken" or roughly, "Championship" in English. The game went offline on March 31st, 2011, as stated by a page that now 404's under the original game link, verbatim.jp/senshuken/. web.archive.org/web/20120409145945/verbatim.jp/senshuken/
The game was seemingly never revived past this date and probably will never be again, but it is likely they still have the game files as it has not really been too long. Retrieving them, however, is another deal.
The game consisted of you (the player) choosing a randomly generated fighting robot and then fighting others online in a basic beat-em-up fashion.
The game was seemingly relatively obscure, as there aren't any articles I can find for it online other than randomly generated pieces.