Red Gem Ring : MM12
You pressed the correct button.
It appears that the rule works like this:
First, take the first letter of each word.
Then, convert that letter into its alphabet position
(A = 1, B = 2, C = 3, … Z = 26).
Next, count backward from Z by that number to find the answer.
For Like:
The first letter is L, which is the 12th letter of the alphabet.
Counting backward 12 letters from Z gives O.
For Share:
The first letter is S, the 19th letter.
Counting backward 19 letters from Z gives H.
For Comment:
The first letter is C, the 3rd letter.
Counting backward 3 letters from Z gives X.
Therefore, the correct answer was X.
You press the X button beneath the frame.
Moments later, a section of the wall beneath the buttons slides open,
revealing a treasure inside— a ring set with a red gem.
You reach into the small hidden compartment and retrieve the treasure.
After securing the treasure, you leave the area.
You have successfully escaped.
You have secured the treasure.
Congratulations!