(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 | |
|---|---|---|---|
 | Flexible Killer by Neb (on 6. June 2025, 10:57) | 56 |  94 % |
| Myopia by wuzzle (on 1. January 2021, 00:00) | 36 | 94 % |
| One-Man Band (H+C Region Sum) by brennan77 (on 22. February 2023, 03:39) | 39 | 98 % |
| King's Gambit by GemmaOane (on 2. August 2023, 19:12) | 89 | 95 % |
| Bálint Kopasz (Tokyo 2020) by Lisztes (on 5. August 2021, 00:46) | 26 | 91 % |
| Rumors (German Whispers) by tallcat (on 8. October 2021, 17:02) | 176 | 97 % |
| Totally Unfair 2 by Joseph nehme (on 11. December 2021, 08:24) | 23 | 96 % |
| A Year in the Making by Polycarp (on 20. February 2023, 01:19) | 28 | 91 % |
| Order Crossing (ft. Nordy) by damasosos92 (on 22. August 2023, 17:39) | 24 | 96 % |
| Not Just Once by jwsinclair (on 11. January 2024, 21:14) | 104 | 96 % |
| Harmonic Split (Yin Yang) by gdc (on 25. April 2025, 16:11) | 177 | 98 % |
| Pebbles (Ambiguous XV/kropki pairs sudoku) by Qodec (on 13. August 2023, 11:59) | 57 | 92 % |
| Multi-sudoku: Orb 3 - Christmas snORBall by DiMono (on 20. December 2021, 18:14) | 31 | 98 % |
| Bloodcursed Arrows by ViKingPrime (on 18. February 2023, 23:00) | 34 | 93 % |
| Another Mathematical Phenomenon by Xenonetix (on 25. September 2025, 01:10) | 32 | 94 % |
| Modular Zipper by gdc (on 7. December 2023, 12:07) | 78 | 95 % |
| Wichtel 2020 (8): Das exotische Spätabendland by wichtel (on 23. September 2021, 22:00) | 35 | 99 % |
| Renban ModE - Little Killer/Renban sudoku by Mr.Menace (on 29. May 2021, 17:43) | 40 | 98 % |
| PIRAT - Buchstabenrätsel / Letter puzzle by DocLogic (on 25. June 2021, 20:03) | 39 | 96 % |
| Arrows, XVs, and Dots by kolot (on 26. August 2021, 09:41) | 44 | 95 % |
