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What can block the view?
Extreme side seats can lose action at the same side of the stage. Very close seats may look up at a high stage edge. Rails can interrupt the lower view from some elevated seats, and an overhang may hide the top of the set from farther back downstairs.
Decide whether the saving is worth it
Read the seller’s exact note and check the section, row and seat. Ask the box office which part of the current production the seat may miss. Compare the price with a centered seat farther away. A partial view is a harder tradeoff if a child is short, you need to see captions or the show depends on full-stage effects.