javascript - Is it possible to disable Ctrl + F of find in page?

Question

I have a puzzle site and its an awful way of cheating. Its okay if only partially, but can it be done?
Something I had in mind was replacing the letters with images, but anything easier than that?

Answer 1

Code

window.addEventListener("keydown",function (e) {
    if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) { 
        e.preventDefault();
    }
})