The word "Mystee" is spelled with a "y" instead of the traditional "i" in the word "mystery." The IPA phonetic transcription for the word is /ˈmɪst(i)/. The use of a "y" instead of an "i" in the spelling of the word could be an intentional alteration to make the word more unique or visually appealing. Despite the change in spelling, the pronunciation remains the same as "mystery."