(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 | |
|---|---|---|---|
 | Suradewoku (Geradeweg/Sudoku) by Wessel Strijkstra (on 14. July 2023, 01:39) | 19 |  98 % |
| Masyup Kakuro by purpl (on 17. March 2024, 22:08) | 20 | 91 % |
| Revivify by Jay Dyer (on 12. July 2025, 11:20) | 80 | 93 % |
| Suguru Chaos Deconstruction #4: Renban + Japanese Sums by mathpesto (on 7. March 2022, 17:30) | 113 | 96 % |
| [TSL] Scenic Railroad by Myxo (on 23. December 2024, 09:24) | 30 | 99 % |
| Dust Storm by Gliperal (on 7. June 2022, 23:29) | 25 | 90 % |
| Kreuzfahrt by pirx (on 14. April 2018, 18:00) | 34 | 99 % |
| Blackjack by apiyo (on 27. October 2020, 07:41) | 36 | 91 % |
| got too many pages stuck together by aqjhs (on 8. November 2025, 08:11) | 39 | 99 % |
| Sudoku Variants Series (310) - Sum Triplets Sudoku by Richard (on 3. March 2021, 00:00) | 75 | 95 % |
| Digital Roots by Andrewsarchus (on 3. October 2021, 19:30) | 12 | 98 % |
| Killocator 2: Killectric Boogaloo by starwarigami (on 7. November 2021, 22:56) | 14 | 95 % |
| Bridges by Xenonetix (on 21. May 2022, 01:35) | 37 | 91 % |
| XXY by ViKingPrime (on 14. March 2023, 22:00) | 11 | 95 % |
| The Three I Love by Freegerator (on 19. August 2025, 05:41) | 15 | 95 % |
| Wichtels Rätselherbst 2025 (6): Multiplikations-U-Bahn (mit Lügen) by wichtel (on 31. October 2025, 20:25) | 14 | 100 % |
| Cryptic Lunchboxes by Undar_Beyond (on 20. June 2020, 17:58) | 52 | 99 % |
| Equilibrium by Xendari (on 18. August 2022, 14:04) | 67 | 98 % |
| Sandwich Sudoku - Find x!!!! Part 4 by ProwlingTiger (on 31. May 2020, 00:45) | 21 | 96 % |
| Signature Sudoku by Nell Gwyn (on 5. September 2022, 06:10) | 16 | 98 % |
