Stealth. As long as there's some way the blindsighted thingy can fail to spot you - there's cover that's meaningful to it's sense, or it's paying attention to something else or whatever - it should still be possible to sneak up on it. Hide/Sneak vs Spot/Liste, whichever seems most apropraite.Of course, if you don't know what senses the critter possesses or how they work, it should be more difficulty (circumstance penalty), and, if you /do/ know, and have a good way around it, you might get a bonus. Either way, it should always be possible - merely having a sense, however accute, doesn't mean you can never just fail to notice something.
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