(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 | |
|---|---|---|---|
 | Fill Rank Fullomino by Myxo (on 31. May 2023, 13:26) | 57 |  98 % |
| Wichtel 2022 (4): Traditionelle Japanische Summe by wichtel (on 20. September 2023, 11:11) | 15 | 100 % |
| Japanese Sums #6: Volatility by Myxo (on 21. March 2024, 10:05) | 41 | 100 % |
| Wichtels Rätselsommer 2024 (6): Ein seltsamer Mischmasch by wichtel (on 9. September 2024, 20:23) | 23 | 100 % |
| The Light Maze (Chaos Construction, RGB) by Chilly (on 7. January 2025, 16:15) | 34 | 99 % |
| The Lost Sums of Akator by Oripy (on 21. April 2025, 12:00) | 19 | 100 % |
| Copycat Fun by Scojo (on 8. December 2025, 04:35) | 27 | 96 % |
| Summation U-Bahn #4: Skyscrapers by Agent (on 30. September 2024, 09:00) | 39 | 100 % |
| Tetrafolium by Myxo (on 17. February 2025, 15:40) | 93 | 97 % |
| Numbered Blocks by Chad (on 14. February 2024, 23:33) | 33 | 95 % |
| Seeing Around the Corner by Die Hard (on 8. July 2024, 00:07) | 33 | 98 % |
| Wheel of Arrows (arrow + little killer sudoku) by Aspartagcus (on 6. April 2021, 12:20) | 49 | 96 % |
| Ninelives [X-Sums Chaos Construction] by Panthera (on 22. June 2021, 19:30) | 22 | 100 % |
| TE-N [Liar JSCC Ten Line] by Christounet (on 4. July 2024, 14:55) | 23 | 99 % |
| [TSL][S1T1] Prestige (full rank, modifiers) by The Book Wyrm (on 13. October 2024, 18:00) | 21 | 94 % |
| Chaos is a Club Sandwich (9X9) by SenatorGronk (on 19. February 2022, 23:49) | 38 | 95 % |
| Zodiac Project: Cluster of Galaxies by Prof.Dori (on 6. November 2024, 00:51) | 45 | 98 % |
| Hallig-Rundreise by tuace (on 13. April 2015, 00:47) | 50 | 98 % |
| Back to Entropia (Skyscraper, Entropy) by Mad-Tyas (on 20. November 2023, 10:46) | 65 | 97 % |
| Nikolaus Challenge by Luigi (on 6. December 2009, 06:12) | 15 | 92 % |
