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

Answer 1

You can disable the keyboard shortcut in most browsers (IE9, Firefox, Chrome, Opera), but you can't stop someone using Find by clicking it in the browser.

Here's some jQuery-powered JavaScript that does it:

$(window).keydown(function(e){
    if ((e.ctrlKey || e.metaKey) && e.keyCode === 70) {
        e.preventDefault();
    }
});

Taken from http://caniuse.com/, where this feature regularly irritates me. On that site, it's used to make CTRL+F do a custom search on the page, instead of disabling it completely.