(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 | |
|---|---|---|---|
 | Privy (German Whispers/Renban/Sandwich) by dumediat (on 24. April 2023, 14:06) | 61 |  95 % |
| Chaos Construction - Oenopion's Return by Niverio (on 31. May 2023, 22:18) | 101 | 97 % |
| LM-Überbleibsel: Krypto-Teamrunde by uvo (on 28. November 2015, 10:00) | 76 | 99 % |
| Killer Numbered Rooms by the_cogito (on 21. March 2023, 21:04) | 38 | 95 % |
| Hakyuu-Hitori Kombi by pwahs (on 28. June 2011, 11:36) | 49 | 97 % |
| Vers la Flamme by Piatato (on 17. May 2021, 20:39) | 46 | 95 % |
| Bolts by antiknight (on 28. March 2023, 14:49) | 31 | 96 % |
| Re(cursive/entry) by mormagli (on 25. June 2024, 21:03) | 25 | 95 % |
| Slitherbahn by KNT (on 5. August 2024, 09:00) | 49 | 100 % |
| Witchness Protection Program by Sotehr (on 9. September 2025, 15:45) | 23 | 90 % |
| Made in the Shade (Heyawake CC) (w/ SennyK) by mellowrobinson (on 3. February 2026, 17:49) | 28 | 100 % |
| Double, Double by zetamath (on 13. August 2022, 22:07) | 90 | 97 % |
| Crypto Japanese Cave (1) by KNT (on 11. October 2022, 08:04) | 84 | 98 % |
| Repetition Legitimizes (Dynamic FOW) by gdc (on 7. January 2025, 18:59) | 187 | 95 % |
| Prohibitive by jwsinclair (on 9. May 2025, 00:10) | 61 | 94 % |
| Schlangen im Fillomino-Nest III by tuace (on 3. March 2017, 11:24) | 28 | 99 % |
| Rubik's Cube by juggler (on 22. February 2024, 02:25) | 82 | 95 % |
| Arrows and Dots by kolot (on 21. August 2021, 13:12) | 43 | 94 % |
| Mathrax Fillomino by Gliperal (on 28. November 2022, 01:44) | 40 | 96 % |
| Killer Sudoku #3 ('Central Tendency') by PixelPlucker (on 2. January 2022, 05:59) | 47 | 97 % |
