(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 | |
|---|---|---|---|
 | Das Prinzip der Polarität by tuace (on 3. September 2017, 17:16) | 24 |  96 % |
| Wichtel 2017 (8): Ein rätselhaftes Experiment by wichtel (on 17. August 2018, 03:05) | 35 | 100 % |
| WPC Preparation 2019: Loopfinder by pwahs (on 3. January 2021, 16:23) | 14 | 100 % |
| Fission (Classic Thermo) by emmettcito (on 7. May 2021, 12:37) | 27 | 95 % |
| Archery Target by Nahileon (on 24. April 2022, 15:48) | 39 | 97 % |
| Fillomenon by DarthParadox (on 2. October 2023, 19:14) | 106 | 96 % |
| Afterlife (Yin Yang Fillomino Deconstruction) by Agent (on 15. November 2022, 09:00) | 61 | 100 % |
| Entropia (Skyscraper, Entropy) by Mad-Tyas (on 16. January 2023, 12:15) | 45 | 91 % |
| Japanese Sum Cave Cipher #15: Doppelcipher by KNT (on 3. October 2023, 18:10) | 41 | 100 % |
| Miracle Clones [Tribute to Botaku] by Undar_Beyond (on 10. November 2020, 20:34) | 29 | 90 % |
| Gin (11x11 Deconstruction) by lerroyy (on 13. November 2022, 23:51) | 23 | 99 % |
| J-Sum Country Chaos by Cephalo (on 23. June 2023, 10:00) | 23 | 99 % |
| Liar Japanese Sums #5 - Ciphered Cave by Niverio (on 11. February 2023, 11:40) | 47 | 99 % |
| Arrow Forest by PotatoHead21 (on 28. September 2021, 09:51) | 13 | 90 % |
| Friendly X-Sums (Chaos Construction) by thoughtbyte (on 16. July 2022, 23:11) | 36 | 99 % |
| Quicksort by filuta (on 29. June 2023, 14:15) | 10 | 100 % |
| Make Room by Jay Dyer (on 5. July 2023, 00:36) | 27 | 96 % |
| Donuts by Die Hard (on 26. October 2023, 03:30) | 24 | 100 % |
| Japanese Dominos by KNT (on 14. March 2024, 15:59) | 45 | 99 % |
| Belagerungsturm by Myxo (on 22. September 2024, 14:12) | 23 | 97 % |
