qqwref | 255 puzzle in 28:16.555 @qqwref2 | Uploaded October 2012 | Updated October 2024, 13 hours ago.
It's a 16x16 sliding puzzle. Second attempt, first was like 38 minutes, so this is a pretty good improvement (probably mostly thanks to the rainbow coloring!). This took 9940 moves at 5.859 tps, as you can see from the video. I recorded this at 10x speed.

I'm thinking I should've done more rows before switching to columns, as I had some trouble making the first few columns... the extra movement might be worth the recognition.

You can find the latest version of this program here: speedsolving.com/forum/showthread.php?38966-Mr-Toad-s-Fifteen-puzzle-with-timer-%28modified-by-stannic%29