(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 | |
|---|---|---|---|
 | Chaos Construction: Double Arrow by Xendari (on 14. November 2023, 02:19) | 82 |  96 % |
| 4-Stern-Star-Battle by CJK (on 1. July 2021, 10:09) | 50 | 94 % |
| Glass Half Summed (Chaos Construction) by sfushidahardy (on 25. August 2024, 01:10) | 68 | 98 % |
| Ophidiophobia by marty_sears (on 14. August 2024, 14:45) | 164 | 97 % |
| RAT RUN 36: Alternating Currant by marty_sears (on 29. April 2026, 04:05) | 365 | 96 % |
| Buchstabenpaarreihen (4) by BFaw (on 30. March 2016, 11:00) | 36 | 97 % |
| Scratches by PrimeWeasel (on 11. April 2021, 09:27) | 13 | 95 % |
| Capulet [Variant Sudoku] by wisty (on 18. June 2022, 05:36) | 46 | 95 % |
| Mountain Aven by mormagli (on 2. October 2022, 04:37) | 15 | 90 % |
| Friendly Indexers by thoughtbyte (on 1. June 2023, 06:18) | 12 | 91 % |
| Momohime's Human Beatbox Party by Morisenseiisgod (on 12. December 2023, 15:24) | 13 | 98 % |
| Top Right Boi (Psycho look-and-say/Arrow) by dumediat (on 21. June 2025, 12:00) | 31 | 93 % |
| Counting Cages by plasmath (on 17. January 2026, 14:46) | 33 | 95 % |
| Gerade Ungerade Tapa-Höhle by tuace (on 7. December 2015, 12:20) | 51 | 98 % |
| Sandwiched Clues by RockyRoer (on 5. March 2021, 11:35) | 20 | 96 % |
| Regional Differences by apiyo (on 24. May 2021, 14:37) | 22 | 97 % |
| Border Vision by wooferzfg (on 15. April 2022, 03:53) | 45 | 97 % |
| Chaos Construction: Oblivion by XeonRisq (on 26. January 2023, 06:00) | 20 | 97 % |
| Rank Up 06 - Fibonacci Squishtroquadri by ThePedallingPianist (on 14. July 2024, 01:08) | 48 | 98 % |
| Sub categorizing by NicoD (on 30. March 2026, 05:30) | 20 | 94 % |
