(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 | |
|---|---|---|---|
 | Tapa-Berührungsrundweg by usp (on 16. July 2014, 00:00) | 64 |  98 % |
| Normal Lunchbox by Undar_Beyond (on 14. May 2020, 11:26) | 65 | 95 % |
| Sum Set Sudoku by Genomico (on 11. May 2021, 00:00) | 26 | 99 % |
| Chromosome by ICHTUES (on 16. May 2021, 06:00) | 98 | 96 % |
| Multi-sudoku: Orb 3 - Christmas snORBall by DiMono (on 20. December 2021, 18:14) | 25 | 99 % |
| Glyphs #3 by damasosos92 (on 12. January 2023, 16:17) | 26 | 95 % |
| Mislabeled Killers by CaptZebraCakes (on 27. June 2024, 04:35) | 128 | 98 % |
| San Diego by SenatorGronk (on 21. August 2024, 02:49) | 25 | 94 % |
| XV*3.2 by NurglesGift (on 26. July 2024, 10:05) | 136 | 97 % |
| A Horse with No Name (Broken 159) by purpl (on 2. January 2022, 18:01) | 42 | 96 % |
| Consistency (Equalines Sudoku) by Mad-Tyas (on 6. November 2023, 08:46) | 45 | 96 % |
| Uraninite (Killer cages, Odd/Even) by Bellsita (on 24. July 2024, 20:22) | 82 | 91 % |
| Knapp-daneben-Kryptos (6): Japanische Summen by ibag (on 2. February 2014, 21:29) | 55 | 98 % |
| Waben Summenkropki Invers und knapp daneben by Luigi (on 3. February 2010, 14:09) | 47 | 95 % |
| UNPROBLEMATISCH - Buchstabenrätsel by DocLogic (on 1. January 2020, 13:06) | 48 | 92 % |
| Slices by Joseph nehme (on 31. July 2021, 12:43) | 45 | 96 % |
| Odd/Even Sandwich Sudoku by Piatato (on 2. August 2021, 13:33) | 45 | 91 % |
| Friendly Sums by Jay Dyer (on 30. December 2021, 21:31) | 14 | 96 % |
| Stay Outside by EricRathbun (on 5. May 2022, 00:03) | 18 | 94 % |
| Proximity by XeonRisq (on 4. June 2022, 23:00) | 14 | 98 % |
