(Very) Hard AND nice puzzles

The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.

	Description	solved	Rating
	Mine-craft by sangchoo1201 (on 21. April 2026, 11:21)	15	96 %
	The Stinger by Mark Sweep (on 21. October 2020, 12:31)	51	93 %
	Maria by dennischen (on 9. March 2024, 06:46)	54	90 %
	a spikier conundrum by aqjhs (on 23. October 2025, 09:10)	51	93 %
	Dutch Flat Mates (Japanese Sums) by Flinty (on 9. October 2024, 11:30)	93	93 %
	Christmas Cat Run by phil_the (on 2. January 2025, 14:25)	42	95 %
	Normal rules in an altered world by Kjupatrick (on 13. February 2026, 14:57)	21	91 %
	Triples by zetamath (on 3. November 2021, 03:40)	69	96 %
	The Maltese Zipper by Oddlyeven (on 31. December 2023, 16:06)	48	96 %