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Takara-Playmates agreement
The PC version of Battle Arena Toshinden includes Earthworm Jim as a hidden character (unlockable by entering a code). This is because of the deal that Playmates (publisher of the first two Earthworm Jim games) and Takara (publisher of the Battle Arena Toshinden series) had made: whilist Takara would publish the Earthworm Jim games in Japan, Playmates would publish Toshinden 1 (PC), 2 and 3 in the US.