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Still trying to reconcile what's going on in level 2. Do I need to accomplish this over multiple attempts?

The game is trying to teach you how basic rules of quantum mechanics work. In reality, emitting a single particle leads to probability of it reaching multiple detectors with a given chance. You have to set the splitters in such a way, that all detectors can be reached with a chance greater than 0.

Try using a straight beamsplitter to send the photon back somewhere it's already been.

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