Tokyo - Nintendo said on Tuesday that it has filed suit against five Japanese companies, accusing them of importing and selling equipment that allows users to play pirated games on Nintendo DS handheld game devices, Reuters reported.

In addition to Nintendo, the plaintiffs in the lawsuit include 54 other Japanese software firms.

The lawsuit takes aim at a software emulator called R4 Revolution, and similar devices.

"These devices allow playing of copied game programs which were obtained from illegal uploading Web sites on the Internet and which could not be played on Nintendo DS in a normal situation," Nintendo said in a statement provided to GameSpot.

"Nintendo and the game software developers are suffering tremendous loss caused by the import and distribution of such devices."

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