(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 | |
|---|---|---|---|
 | Shuriken by XeonRisq (on 4. June 2023, 22:00) | 66 |  94 % |
| The Big Zipper by marty_sears (on 1. November 2023, 14:04) | 147 | 95 % |
| 2024 by starwarigami (on 31. December 2023, 00:00) | 65 | 96 % |
| Quadrilateral by jwsinclair (on 20. April 2024, 18:03) | 106 | 98 % |
| Enigma Sequence by XeonRisq (on 31. August 2024, 20:00) | 20 | 95 % |
| Campobasso (XY-Difference-Paare) by glum_hippo (on 1. October 2024, 15:33) | 18 | 92 % |
| Roman Architecture by Scruffamudda (on 15. October 2024, 06:42) | 57 | 94 % |
| Why Fog So Bad At Archery? (Happy Birthday ViKingPrime!) by vitaminz (on 20. April 2025, 14:27) | 86 | 93 % |
| The Apple Bush and The Apple Tree by JMoat13 (on 23. May 2025, 16:06) | 32 | 95 % |
| Rank X-Sums by damo_89 (on 5. September 2025, 22:30) | 28 | 92 % |
| Tail of the Okapi by glum_hippo (on 22. December 2025, 20:41) | 16 | 97 % |
| SET Square'd by LeaVulpina (on 9. February 2026, 14:14) | 32 | 96 % |
| Holographic Principle (Chaos Construction) by sfushidahardy (on 18. July 2024, 04:07) | 229 | 98 % |
| Turbid harbinger by NicoD (on 20. June 2025, 05:30) | 70 | 95 % |
| Foggy Pea-losophy by SamuPiano (on 2. November 2024, 15:44) | 140 | 97 % |
| Canal View Sudoku by KNT (on 27. July 2022, 03:51) | 60 | 97 % |
| Arvada - a Beachcomber Sudoku by glum_hippo (on 3. November 2023, 04:20) | 57 | 96 % |
| Cabo Verde by Qodec (on 3. October 2022, 20:17) | 115 | 99 % |
| Horseshoes and Handgrenades by purpl (on 15. September 2021, 17:23) | 49 | 98 % |
| Circuit Board [Standard U-Bahn] by wisty (on 14. November 2023, 17:10) | 43 | 99 % |
