There are two ways to solve this room.
One:
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×Be efficient. You should be able to step on the checkpoint near the middle by the time the roaches hatch.
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×After that, just try to kill one roach (or queen) per turn until they're all dead.
Two:
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×This is an error in design, but it may work to your advantage.
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×Hit the orb twice, to eliminate the timer.
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×
First Delver! (I was the first non-tester/dev
to conquer TCB.)
d
/dy