(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 | |
|---|---|---|---|
 | AAAAAAAAA (Cipher Numbered Rooms) by tesseralis (on 8. July 2022, 10:06) | 36 |  94 % |
| The Friendly Knights by Bert (on 13. February 2024, 05:07) | 38 | 94 % |
| Rex Parvae by JayForty (on 27. May 2022, 17:48) | 70 | 99 % |
| Sudomino by Prof.Dori (on 26. February 2024, 14:27) | 70 | 98 % |
| 1234 (Arrow Sudoku) by ProRock (on 24. June 2024, 15:21) | 31 | 90 % |
| Somewhere Over The Rainbow by ICHTUES (on 30. May 2021, 06:00) | 51 | 96 % |
| Cutting Corners (by jovi_al & Qodec) by Qodec (on 4. September 2021, 10:44) | 52 | 97 % |
| Coral Creek by Jay Dyer (on 17. June 2023, 01:07) | 50 | 96 % |
| The Answer to the Ultimate Question by ViKingPrime (on 11. October 2024, 20:30) | 100 | 97 % |
| Tag 20 - Shakashaka by CJK (on 11. February 2021, 14:56) | 30 | 95 % |
| Optimization by djorr (on 23. June 2021, 16:10) | 19 | 97 % |
| Double Digit Drama by mormagli (on 21. February 2024, 06:25) | 22 | 99 % |
| Uneasy Alliances by ViKingPrime (on 30. May 2024, 16:00) | 20 | 93 % |
| Invasion! by Sotehr (on 27. October 2024, 00:00) | 18 | 96 % |
| Mini-Colossal Octoquadri III: Sukoro by sfushidahardy (on 11. June 2025, 17:52) | 31 | 100 % |
| X-Square Whispers by Cane_Puzzles (on 15. May 2022, 17:20) | 35 | 96 % |
| Entropic Pieces by Myxo (on 11. March 2023, 19:35) | 32 | 98 % |
| BYO RSL by mathpesto (on 5. November 2023, 15:55) | 33 | 94 % |
| Mystery Lines Somedoku by blackjackfitz (on 11. September 2024, 18:29) | 36 | 93 % |
| Scalding torrent by NicoD (on 3. August 2025, 05:30) | 35 | 93 % |
