Hi Cinera,
Hitting two orbs simultaneously is
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×indeed the correct approach.
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× If that seems impossible, carefully look which doors can be 'paired up' easily.
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×There's three pairs of orbs to hit...
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× Try to simultaneously hit orbs that are one 'horse jump' apart. E.g NW/S etc.
Hope this helps.
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Autocorrect is
not my friend. Apologies for the typos.