I DIE IN GAME(WATCH VIDEO)

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This Hex digits "79616C50" stands for "Play".
Look into this ASCII table and you can find it yourself...

You have to do this in reverse order.
506C6179 = Play
Hex 0x50 = P
Hex 0x6C = l
Hex 0x61 = a
Hex 0x79 = y
But Cheat Engine can directly convert your input. You don't need to know each Hex digit corresponding to the letters.