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Simple Box Under the Bridge - Hard

Simplified version. There is way to cheat this test.

SPOILER: CHEAT WAY: destroy the cube, when it respawns, it crosses the laser on it's way down. When it does cross it, the sphere rooms field fades for 0.1 sec. You can shoot trough that cap if you spam.
Feel free to suggest how I block that way to cheat :)
How ever there is another way to do this test. And I dont want to spoil it :)