- Girdeux's Syphon Filter Site
- Contains guidelines about the basic controls of the game, survival tips, and an overview of the background plot.
- Syfilpedia
- Contains various resources about the installments of the series, including the PSP version.
- Syphon Filter - Logan's Shadow
- Official site of the shooter providing information on the game’s background story and characters. Also features a video trailer and player message board.
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