(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 | |
|---|---|---|---|
 | Sudoku Variants Series (328) - Sudoku Heatmap by Richard (on 7. July 2021, 00:00) | 61 |  94 % |
| Battle With The Archers 16: Judgment Trio by Playmaker6174 (on 17. September 2021, 12:12) | 56 | 97 % |
| Subway Lines (Chaos Sandwich Sudoku) by Agent (on 15. April 2022, 09:00) | 55 | 98 % |
| Archery Zone by Ridhwan (on 3. June 2023, 18:16) | 64 | 97 % |
| Dutch Flat Mates: Inntel Zaandam (Between Lines) by Qodec (on 14. January 2026, 07:00) | 54 | 97 % |
| Coincidence by fuxia (on 1. June 2024, 14:37) | 54 | 90 % |
| Jungle Gym by PotatoHead21 (on 28. September 2023, 01:08) | 104 | 96 % |
| Krypto-Kongruenz-Rundweg (2) by ibag (on 6. September 2009, 18:31) | 45 | 94 % |
| Suspension of Disbelief by XeonRisq (on 27. June 2022, 17:00) | 55 | 97 % |
| Et Tu Brute? by Scojo (on 19. March 2024, 14:04) | 50 | 95 % |
| Killer Sudoku - Ignorant of 9's by ProwlingTiger (on 10. May 2020, 00:49) | 45 | 94 % |
| The Suducku King (Thermometer + Renban sudoku) by Aspartagcus (on 1. May 2021, 20:51) | 44 | 94 % |
| Chaotic Sandwiches (Entropy Special) by Mad-Tyas (on 2. January 2022, 21:29) | 44 | 96 % |
| Bergentrückung by Gerhard1963 (on 10. October 2024, 23:00) | 44 | 90 % |
| Freeze by Jobo (on 17. December 2024, 07:44) | 99 | 98 % |
| Erster Pfeilchenstrauß by glum_hippo (on 16. August 2020, 09:33) | 44 | 95 % |
| Nonconsecutive Quads by LucyAudrin (on 24. July 2021, 20:18) | 48 | 91 % |
| Insight by Xenonetix (on 15. January 2022, 04:54) | 37 | 96 % |
| Region X-Sums by twototenth (on 4. October 2022, 08:00) | 40 | 92 % |
| split pearsonality / dopealgänger by aqjhs (on 2. November 2025, 23:53) | 43 | 98 % |
