(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 | |
|---|---|---|---|
 | Parity Poopers by aleph-0 (on 29. February 2024, 12:59) | 18 |  98 % |
| Cruel-sum Samurai (Duality lines, Mean minis, 6x6 Samurai) by AnalyticalNinja (on 21. September 2024, 18:53) | 35 | 93 % |
| Twenty (and) Twenty-Five by Big Tiger (on 26. December 2024, 23:22) | 33 | 95 % |
| Crossbow Training by Sniglett (on 29. December 2024, 02:18) | 28 | 94 % |
| Two Times a Killer by EnPee (on 2. January 2025, 00:12) | 22 | 93 % |
| 2025 Chaotic X-Sums (9x9) by Florian Wortmann (on 25. January 2025, 14:34) | 118 | 98 % |
| What is the sum? by Benji1810 (on 23. February 2025, 19:13) | 24 | 91 % |
| Stretch marks by Qodec (on 23. March 2022, 21:37) | 98 | 98 % |
| Little Deadly Construction by Myxo (on 21. December 2024, 12:32) | 86 | 99 % |
| Same Difference by marty_sears (on 9. October 2023, 13:18) | 91 | 96 % |
| Rivets by XeonRisq (on 12. June 2023, 04:00) | 68 | 96 % |
| Pea-thagorean Theorem (with sujoyku) by ChinStrap (on 6. January 2025, 03:46) | 73 | 94 % |
| Zodiac Project: Minefield Maneuvers by SamuPiano (on 30. June 2024, 15:00) | 62 | 97 % |
| Reign of Cassiopeia by Tyrgannus (on 24. June 2022, 06:25) | 59 | 95 % |
| /4 /5 by Nahileon (on 18. March 2022, 11:03) | 55 | 99 % |
| Quad van de Wetering by PotatoHead21 (on 31. March 2024, 23:38) | 101 | 98 % |
| Rundweg andersrum 3 by Menxar (on 14. September 2009, 10:10) | 47 | 95 % |
| Killer/Little Killer Sudoku - Find x! - Part 2 by ProwlingTiger (on 16. May 2020, 20:50) | 50 | 96 % |
| Criss Cross by FullDeck-Missing (on 19. July 2022, 15:04) | 50 | 92 % |
| Summenbild-Rundwegrätsel (1) by Uhu (on 3. November 2020, 20:29) | 41 | 98 % |
