It's endgame theory but it is not a puzzle because there many ways to do this. Puzzles are to be solved and how could anyone figure out what you thought? Better to present this as theory without ticking the puzzle box.
PawnyBegginer's Puzzle:Mate on a LADDER?!
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A LADDER?!!! How could that be CHECKMATE?! Hey begginers! Look over here. Today you're trying to checkmate with two rooks. Be careful, a king is possible to capture----come on, get the point. This is called the"Ladder Mate". Good luck, and mention this---- a step of the ladder can easily FALL...