Master, this thing is for rookies. Rookies, I'll say!
If you can't solve this one, you have no place to go

Of course, but don't forget the flookies. they always get the 50%!
Rookies & flookies... For the sake of this "thing" staying in true keys, let's hope this joke is kept inwards, otherwise 50% will be more likely 66.666666666%... unless some have being smoking glukies then the odds may of course drop drastically... Spookies...
I mean ...
SP000KIES!
That's a nice idea. I believe this position adds one more move:
Yes it does! Extra intro moves add flair and disguise to an endgame study but much less to a directmate problem. The common viewpoint is that it shouldn't be longer than required to express the thematic content. Which is 3 moves here. There are exceptions of course like tasks where long paths and repeat patterns are part of the intended expression (see drdos7's puzzles). A bigger minus is that 2 of the black king moves after the key generate "short mates" absent in the 3-move version.
Btw, both the 4- and 3-move version take flight squares on the key which is commonly undesirable. To show there are pluses and minuses in every creation!
I made this puzzle from another topic with 2-rook checkmates but I preferred the promotion version. Here's its predecessor where the key takes no flight squares on aggregate:
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Have another mate in 3:
Wonderful! Don't recall seeing it before. Reminiscent of Paul Morphy's famous 2-mover but this one is for grown-ups! Best defense: 1. ..Bf6!
Wrong! (even if you intended "rook e8 checkmate")
Checkmate in 3 moves. Eazy peazy, right?
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