Touhou Project (All games)

All the Touhou games, patched into English for your convienience.
The first 5 even come with a PC-98 emulator, free of charge.

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For those of you who don't know, Touhou is a Japanese game series made by one person. They are "bullet hell" shooters. They come in 4 difficulties, Easy, Normal, Hard, and Lunatic, with an extra stage thrown in.