(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 | |
|---|---|---|---|
 | Killer Sandwich by Alexander Rappa (on 31. October 2020, 19:16) | 46 |  99 % |
| Memphis by ICHTUES (on 20. February 2022, 06:00) | 47 | 96 % |
| The Last Hurrah? by Playmaker6174 (on 2. August 2022, 07:17) | 51 | 99 % |
| Pastiche by zetamath (on 4. November 2022, 00:18) | 89 | 95 % |
| Das Krypto-ABC-tje des Außerirdischen by ibag (on 22. August 2012, 14:56) | 31 | 96 % |
| Rätselmix kryptisch by AI1463 (on 9. July 2015, 00:00) | 32 | 99 % |
| KUCHEN - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 6. January 2020, 11:29) | 34 | 94 % |
| Paradox by Xenonetix (on 5. June 2022, 01:11) | 29 | 98 % |
| Farfalle by cam (on 2. December 2022, 00:25) | 45 | 95 % |
| Whispers of Entropy 2: Balance by Mad-Tyas (on 6. March 2023, 09:01) | 34 | 98 % |
| Entropy Lockout by Mad-Tyas (on 22. October 2024, 00:01) | 36 | 91 % |
| Seer (Chaos Construction) by sfushidahardy (on 11. October 2024, 04:24) | 57 | 98 % |
| Petroglyph by DadJokes (on 7. December 2022, 19:53) | 89 | 98 % |
| Hochhaussummen-Sudoku [5] Killer by Errorandy (on 29. April 2020, 16:00) | 23 | 97 % |
| Lend Me Your Eyes by RockyRoer (on 17. November 2020, 01:46) | 23 | 97 % |
| Time capsule by Testarossa (on 22. September 2021, 15:41) | 24 | 93 % |
| Renban Rocket by the_cogito (on 3. January 2022, 18:20) | 47 | 96 % |
| Torque by randall (on 16. October 2022, 07:21) | 24 | 93 % |
| Ambiguous Little Killer + X-Sums Clues by Jeet Sampat (on 27. October 2022, 16:07) | 26 | 96 % |
| Limitless Potential #2: The Wanderer's Path by Playmaker6174 (on 12. May 2023, 16:49) | 22 | 95 % |
