(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 | |
|---|---|---|---|
 | Beispiel für Roller Coaster mit Extras 25 by Uhu (on 3. March 2022, 06:35) | 27 |  100 % |
| Urban Sprawl by jwsinclair (on 27. July 2022, 18:56) | 35 | 97 % |
| Glass Half Empty by mellowrobinson (on 12. August 2025, 16:19) | 38 | 97 % |
| Doppelte Adventssummen 4. Advent by Luigi (on 20. December 2015, 08:04) | 53 | 96 % |
| Wichtel 2022 (7): Kryptisches Fillominurikabe by wichtel (on 11. October 2023, 14:14) | 13 | 95 % |
| upcoming upheaval by aqjhs (on 24. February 2025, 00:00) | 25 | 91 % |
| Su-duo-ku (aka Project "4D Sudoku"): Apollo & Artemis by Playmaker6174 (on 28. September 2025, 16:00) | 11 | 98 % |
| Modular Spirals by Nell Gwyn (on 5. February 2026, 06:45) | 12 | 93 % |
| CHRISTBAUM - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. December 2021, 19:00) | 31 |  94 % |
| Armored Harriers by wooferzfg (on 30. April 2023, 06:06) | 29 | 96 % |
| Killer Lunchboxes by Undar_Beyond (on 16. June 2020, 16:35) | 53 | 98 % |
| Mystery Box by Nahileon (on 2. August 2022, 22:09) | 34 | 92 % |
| Unter der Lupe (Instructionless) by Myxo (on 27. September 2023, 10:20) | 45 | 96 % |
| »Little Killer« unter Damen by glum_hippo (on 20. May 2020, 08:25) | 21 | 91 % |
| Doubles Hidden Inside Squares (Double Trouble) by Mad-Tyas (on 8. September 2021, 13:28) | 17 | 98 % |
| Three Rights and a Wrogn by SirWoezel (on 29. July 2022, 13:47) | 18 | 95 % |
| Small Phistomefel by Stoer (on 23. April 2023, 13:19) | 22 | 91 % |
| Chackstones (XVXV/Kropki pairs/X-sums) by dumediat (on 27. April 2024, 02:42) | 37 | 92 % |
 | gimmie gimmie gimmie by aqjhs (yesterday, 12:21) | 18 | 91 % |
| T-Time (Anti-Knight Renban Killer Sudoku) by Phistomefel (on 13. June 2023, 21:12) | 193 | 97 % |
