Lets examine the short fragment of the story:

"... What is that? A 3-complete word?" The
puzzle-solver said. "Can it really be solved?"
He thought as he tried different codes in
the keyboard to open the door

A voice in the dark answered: "Sure! it can
be solved, just identify the pattern in the
words"

"You... you designed the pattern, don't you?"
Our puzzle-solver replied. "no, it was already
designed. Use your eyes to find the pattern",
the voice said to him.

Then, after deeply thinking, he said: "Yes!...
it's solved!" Promptly, he opened the door
using the code he found. "Excellent! the
pattern was always in my hands", then he left
the room, looking for the next puzzle to solve...

Maybe you already saw the pattern.

Extracting all uppercase letters from the text gives us the phrase
WATCH AS YOU TYPE

Additionally to this answer for this question, we now have another hint for solving What is a R-complete Word™

Let's examine the short fragment of the story:

"... What is that? A 3-complete word?" The
puzzle-solver said. "Can it really be solved?"
He thought as he tried different codes in
the keyboard to open the door

A voice in the dark answered: "Sure! it can
be solved, just identify the pattern in the
words"

"You... you designed the pattern, don't you?"
Our puzzle-solver replied. "no, it was already
designed. Use your eyes to find the pattern",
the voice said to him.

Then, after deeply thinking, he said: "Yes!...
it's solved!" Promptly, he opened the door
using the code he found. "Excellent! the
pattern was always in my hands", then he left
the room, looking for the next puzzle to solve...

Maybe you already saw the pattern.

Extracting all uppercase letters from the text gives us the phrase
WATCH AS YOU TYPE

Additionally to the answer for this question, we now have another hint for solving What is a R-complete Word™?

Well, maybe the hint helps solving the R-complete Word!

Extracting all uppercase letters from the text gives us
WATCH AS YOU TYPE

Lets examine the short fragment of the story:

"... What is that? A 3-complete word?" The
puzzle-solver said. "Can it really be solved?"
He thought as he tried different codes in
the keyboard to open the door

A voice in the dark answered: "Sure! it can
be solved, just identify the pattern in the
words"

"You... you designed the pattern, don't you?"
Our puzzle-solver replied. "no, it was already
designed. Use your eyes to find the pattern",
the voice said to him.

Then, after deeply thinking, he said: "Yes!...
it's solved!" Promptly, he opened the door
using the code he found. "Excellent! the
pattern was always in my hands", then he left
the room, looking for the next puzzle to solve...

Maybe you already saw the pattern.

Extracting all uppercase letters from the text gives us the phrase
WATCH AS YOU TYPE

Additionally to this answer for this question, we now have another hint for solving What is a R-complete Word™