I've done a parity vid for this case before on my channel. I've had a request to cover parity on the 4x4 and 5x5, so I'll do that today at some point and cover both puzzles.
btw, this forum does blow, but most of the people here are great. The reason it blows is that it is unmoderated and full of spam and people who ask the same questions every day. The latter part is down to the poor organisation of the forum boards.
Most of the people who are regulars here are in fact very helpful. Please also bear in mind that if you don't get an answer within a few minutes, it's not our fault. I'm in a different timezone to a lot of members (UK, some are in Australia / US / Canada or maybe even other countries where English isn't a first language). Give us time to answer please.
Please take off topic discussion off this forum. Thanks.