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"Touch the box" -> "Press OK"
A) "Press OK" is generic.
B) It rarely (never?) says "OK" when this command pops up.
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"Touch either box" -> something like "Select"
Again, "Select" is boring.
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"Get ready!...Go!" is an English phrase. "Get ready!...Engage!" isn't. Though it is still grammatically correct.
If it's grammatically correct, and in English, then it's an English phrase. I have to ask again, do you know what Engrish is?
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I would say DEAD because it indicates the current status of the enemy.
As opposed to "KILL" indicating that you GOT A KILL on this enemy.
Писатель всегда будет в оппозиции к политике, пока сама политика будет в оппозиции к культуре.