When I Played the Perfect Bait for My Coworker's Joke

So, let me set this up a bit. Last week at work, my colleague Alex and I had a bit of a prank war going on with our other coworkers. It all started when someone put silly putty in my keyboard, which was hilarious but also a hassle to clean out. So naturally, I decided it was time for some sweet revenge. I overheard Alex planning something mischievous against another coworker named Jamie, who always complains about the coffee machine and its endless need of cleaning. Now, here's where things get interesting: Alex has this really weird obsession with puzzles and riddles, so I figured out a clever way to turn that back on him. I created a fake memo from our boss, stating that there was an urgent security update needed for everyone's computers. The catch? It had a complicated password that only Alex could crack using his puzzle-solving skills, specifically tailored to make it look like a personal challenge just for him. So I placed the note in Jamie’s desk drawer with some coffee grounds as an extra hint. The next day, Alex spent almost two hours trying to figure out the password and got really frustrated when he couldn't find any clues other than the messy coffee machine near Jamie's workspace. He finally solved it and discovered that all I did was lock his computer screen saver for one minute. Yes, just one minute. I felt a little guilty about leaving Alex so stressed over nothing important, but hey, it wasn’t my problem anymore once he figured out the joke. So here’s what I’m wondering: Am I really being too harsh by using someone's quirks against them in this way? Is that not crossing the line when it comes to workplace pranks? What do you all think about this kind of retaliation and is it worth risking a friendship over some office humor?