(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 | |
|---|---|---|---|
 | Split Decision by ViKingPrime (on 30. August 2023, 04:42) | 24 |  97 % |
| On The Bottom Shelf (Nabner Modifier Sudoku) by Silverstep (on 9. September 2023, 00:24) | 17 | 95 % |
| Adventskalender 2023, Türchen 15 - Knapp daneben U-Bahn by Zzzyxas (on 15. December 2023, 07:00) | 30 | 94 % |
| Bonzo's Montreux by kuraban (on 22. December 2023, 21:35) | 38 | 91 % |
| Entropy X-Sums by Mad-Tyas (on 30. January 2024, 10:12) | 64 | 94 % |
| Round n Round with Doppelgangers by bodemeister (on 14. February 2024, 11:41) | 22 | 93 % |
| Schrödinger's Knights by lepton (on 9. March 2024, 11:50) | 18 | 92 % |
| 440 Hz by HalfBakedLunatic (on 19. March 2024, 02:38) | 27 | 93 % |
| Lighthouse Hashikabe by Nell Gwyn (on 24. April 2024, 20:42) | 14 | 98 % |
| ABC-Box Hybrid 1.2: A Beautiful Cave (12x12) by Playmaker6174 (on 10. June 2024, 08:30) | 33 | 100 % |
| 4321 (Palindrome XV) by ProRock (on 7. July 2024, 17:25) | 16 | 90 % |
| Rank Up 12 - Doublers by ThePedallingPianist (on 2. August 2024, 03:20) | 36 | 91 % |
| Reign of Arrows (Anti-knight, Arrows) by juddimal (on 8. January 2025, 02:53) | 91 | 95 % |
| Rank Up 19 - Permaculture by ThePedallingPianist (on 17. March 2025, 01:00) | 28 | 100 % |
| Big Brother (Landvermessung/Battenburg Hybrid) by MaizeGator (on 17. April 2025, 03:08) | 17 | 92 % |
| The Nuts by juggler (on 8. July 2025, 23:44) | 49 | 95 % |
| Skygangers by bodemeister (on 26. July 2025, 02:42) | 16 | 95 % |
| Halves and Halve Nots (Dynamic Fog Edition) by ViKingPrime (on 28. September 2025, 22:45) | 39 | 91 % |
| Poles Apart (Remote Sums Chaos Construction) by tallcat (on 14. October 2025, 04:00) | 127 | 99 % |
| Melting Pot by Justalilguy (on 6. December 2025, 07:42) | 11 | 90 % |
