This puzzle took <30 sec. The move rf7 is not forced there is one other option. The result is the same. I mention this as we should look for other moves that our opponent can make when calculating.

g4 was hard to find me, because that was not a check, but creating an undefendable mate threat.

this took less than a minute, every move seemed a natural progression

I stopped looking after Ne6+ and Nxf8, since that's what I'd go for in a real game.

Yes, I posted only the most interesting checkmate from the 5 I solved.

Unfortunately it appears only one puzzle made it to this page. Took about 20 seconds

I see only one example on this post. It took me 2 minutesto solve.