PS3 Echochrome is half the price of PSP version: here's why
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The PSP version of Sony's mind-bending puzzler Echochrome costs twice as much as the PS3 version in Japan, prompting the developer to explain that the PS3 version is merely a taste of the main event on PSP. According to this, the PSP game contains 100 puzzles over the PS3 version's 50. So now you know.
Still no release date for this in the west.