(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 | |
|---|---|---|---|
 | Parity Party Renban Sudoku ('Party Bot') by PixelPlucker (on 31. May 2021, 16:05) | 17 |  95 % |
| A Very Odd Killer by Niverio (on 9. June 2021, 17:55) | 58 | 99 % |
| The 13th Nightmare by Nahileon (on 25. August 2021, 19:08) | 39 | 90 % |
| Battle With The Archers 17: Precision by Playmaker6174 (on 24. September 2021, 14:00) | 44 | 99 % |
| Mysterious Lines 2: All WRAPT Up by mathpesto (on 26. September 2021, 17:25) | 35 | 95 % |
| Kropki-Arrow Party by abed hawila (on 6. November 2021, 09:40) | 42 | 97 % |
| Black Jack by Andrewsarchus (on 5. December 2021, 07:02) | 19 | 97 % |
| Oreo by the_cogito (on 16. January 2022, 18:07) | 13 | 96 % |
| Arrowings (version 2) by kolot (on 27. January 2022, 11:30) | 19 | 93 % |
| Tightly Packed by Cane_Puzzles (on 3. February 2022, 12:01) | 91 | 96 % |
| 2-knight by fritzdis (on 21. March 2022, 20:40) | 52 | 91 % |
| Tutotu by Fafrd (on 10. June 2022, 02:35) | 27 | 97 % |
| Cartesian 159 by noswald (on 19. August 2022, 07:09) | 16 | 91 % |
| Time Twister (Killer/Entropic Lines) by Tyrgannus (on 31. August 2022, 23:15) | 48 | 95 % |
| Watched (Run-on Renbans) by riffclown (on 12. September 2022, 00:18) | 42 | 98 % |
| Chaos Constriction (6x6) by Nordy (on 4. October 2022, 00:34) | 18 | 91 % |
| Wonky Numbers by ThePedallingPianist (on 28. November 2022, 23:09) | 16 | 94 % |
| Dobbledoku by krtekcze (on 27. April 2023, 14:10) | 30 | 93 % |
| Poshley Heights by wooferzfg (on 17. May 2023, 06:04) | 34 | 99 % |
| No Odd Cages (Parity line / killer sudoku) by Mr.Menace (on 11. June 2023, 09:01) | 45 | 97 % |
