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A Locked-Room Mystery

A box in a room on a button. But how to get in?

Some timing required. No tight timing nor portal shots required. If it seems difficult to aim at or too tight, you're probably doing it wrong.
Rarely, the faithplate may fail to correct position the cube on the button. This is not intended.

(The light bridges are just to minimise unintended portal shots and are not part of the puzzle)