Be warned that if you watch this new trailer for SCE Studios Japan's rhythmic warfare sequel Patapon 2, you'll probably be humming "pa pa pa pa pata-pon" for a while.

The download-only PSP game hits May 5 via vouchers, with a PS Store release May 7. Both the retail vouchers and PlayStation Store download carry the same price, $19.99.

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Sony's rhythmic battle game Patapon 2 (PSP) will only be available as a digital download from the PlayStation Store in North America, the company has confirmed.

Though other regions received Patapon 2 in both a digital download and physical UMD form, American retailers will simply sell a download voucher for $20 when it hits on May 5. According to Ars Technica, the PS Store will sell the downloadable game at $15.

Update: Sony has officially priced both versions of the game at $19.99.

"We're considering a digital only format for the Patapon 2 release as a one time test case as we continue to explore consumer preferences for digital content," said Sony Computer Entertainment America corporate communications director Patrick Seybold.

Word of the download-only release follows recent rumors that the next iteration of the PSP hardware will lack a physical disc drive and focus on downloadable games.

The sequel to Interlink's PSP rhythm-action game Patapon has surfaced at the Tokyo Game Show, bringing with it a trailer full of Japanese wackiness.

Designer Hiroyuki Kotani told 1UP that the game will feature a 4-player cooperative mode and an "easy mode" in addition to new songs.

The game does not yet have an American release date but will arrive in Japan in late November.

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