(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 | |
|---|---|---|---|
 | El Psy Kongroo by lerroyy (on 21. July 2022, 04:00) | 37 |  97 % |
| Zum Geburtstag by Uhu (on 5. March 2017, 10:24) | 38 | 99 % |
| Melancholia (Build your own arrow) by Sartor (on 15. June 2024, 23:05) | 46 | 99 % |
| Crypto Japanese Cave (2) by KNT (on 13. October 2022, 23:25) | 60 | 100 % |
| Chaos Construction with Slitherlink clues #2 by Phistomefel (on 21. September 2020, 19:41) | 63 | 98 % |
| Disjoint Little Killer Sudoku - 89 Spinning Tops by DiMono (on 6. December 2020, 18:50) | 19 | 95 % |
| 4-color killer sudoku #1 by Nylimb (on 18. February 2021, 04:42) | 17 | 97 % |
| Disjoint X Arrows by Mesmer (on 15. October 2021, 20:44) | 13 | 90 % |
| Kashmir by lerroyy (on 29. March 2022, 20:26) | 50 | 96 % |
| Mercurial Maxima by AFrayedKnot (on 13. June 2022, 17:59) | 19 | 100 % |
| Chaotic Serpents by jsmirob (on 20. June 2022, 19:26) | 13 | 95 % |
| Double Negative by DadJokes (on 4. October 2022, 13:35) | 17 | 90 % |
| LYLY (double arrows) by Samish (on 5. October 2022, 09:09) | 16 | 95 % |
| The Elephant (Renban, Entropy) by Mad-Tyas (on 3. January 2023, 11:37) | 35 | 99 % |
| The Turtle (Renban, Entropy) by Mad-Tyas (on 28. March 2023, 09:21) | 37 | 98 % |
| Dante's Chaotic Journey by SenatorGronk (on 7. July 2023, 04:16) | 24 | 100 % |
| Squares with Chaotic Circles by thoughtbyte (on 18. January 2024, 09:07) | 41 | 99 % |
| Round totals reclining stucco deconstruction. (8, 7) by Oddlyeven (on 7. February 2024, 18:32) | 25 | 98 % |
| Captain Calamari (Somedoku, Octopus) by ThePedallingPianist (on 18. May 2024, 02:02) | 20 | 93 % |
| Bank Vault by mormagli (on 5. June 2024, 19:45) | 19 | 95 % |
