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Mysterious Rainbow "cube"

There is a mystery tube.
Wait-no! A mystery cube!
What could it do?
It has a strange hue!
And there is a note on the cube.

"Press ENTER to fly high!
And to press RSHIFT to go down from the sky!
Hit UP or DOWN on the arrow keys to activate it!
Just don't get to close or you'll get hit!
And if that happens you'll surely die!"