(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 | |
|---|---|---|---|
 | Misfits by filuta (on 10. November 2022, 17:30) | 40 |  99 % |
| Angel Investigations by ViKingPrime (on 20. October 2025, 00:45) | 25 | 96 % |
| Trapped by a Killer by SudokuExplorer (on 25. November 2021, 00:00) | 63 | 96 % |
| Sudokuvania: Digits of Despair (v1.1.1) by SkepticalMario (on 4. April 2025, 02:27) | 306 | 100 % |
| Triple Japasu IV - Pin7guins nightmare by Luigi (on 23. May 2018, 09:22) | 29 | 95 % |
| Mission Improbable by XeonRisq (on 5. August 2023, 17:00) | 30 | 98 % |
| Entropia (Skyscraper, Entropy) by Mad-Tyas (on 16. January 2023, 12:15) | 52 | 91 % |
| This Thing [Antiknight Series] by wisty (on 10. December 2024, 22:23) | 46 | 97 % |
| Megha-Tropiques by Xenonetix (on 14. February 2022, 21:00) | 30 | 95 % |
| Liar Japanese Sums #5 - Ciphered Cave by Niverio (on 11. February 2023, 11:40) | 54 | 99 % |
| Renrenbanban by DarthParadox (on 25. April 2023, 17:54) | 58 | 98 % |
| Fillomino Chaos Construction #2 by dennischen (on 7. June 2023, 18:15) | 45 | 97 % |
| Japanese Sums: Pentomi-ones by Niverio (on 27. February 2024, 00:58) | 22 | 92 % |
| Hysteria (Chaos Construction) by ThePedallingPianist (on 14. April 2024, 04:56) | 54 | 97 % |
| absolute annihilation by aqjhs (on 6. December 2024, 06:12) | 39 | 94 % |
| Hotel California by fjam (on 2. April 2025, 21:51) | 23 | 96 % |
| Wanddeko by Myxo (on 8. October 2025, 17:39) | 46 | 92 % |
| JS-Bahn (Japanese Summation U-Bahn) by cyddrdrd (on 1. November 2025, 00:00) | 23 | 96 % |
| Consecutive Territories by masetab (on 23. November 2025, 03:31) | 90 | 99 % |
| Summation U-Bahn #3: Castle Wall by Agent (on 17. October 2023, 09:00) | 49 | 100 % |
