The Latest DoDonPachi from Cave is a cross between DoDonPachi Resurrection and DoDonPachi Maximum. Either way, it is playable by US Xbox 360s. Do Don Pachi is a hardcore SHMUP.
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Spring 2013 release date.
Unfortunely, Dodonpachi Dai-Ou-Jou is not region free by Rising Star Games of UK for Xbox 360.
I'm glad to say that I bought Dai-Ou-Jou for $80 for PS2 so I can play it with my Modchip (or PCSX2)
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One of the hardest games ever made. It is supposed to be around 8.0 out of 10 (NTSC-UK) or there abouts.