(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 | |
|---|---|---|---|
 | Toil and Trouble (Collab with ThePedallingPianist) by Scojo (on 30. May 2025, 22:45) | 28 |  95 % |
| Bizarro-doku (w/ MathGuy_12) by ThePedallingPianist (on 24. October 2025, 21:24) | 36 | 95 % |
| Wichtel 2017 (8): Ein rätselhaftes Experiment by wichtel (on 17. August 2018, 03:05) | 38 | 100 % |
| Fillomenon by DarthParadox (on 2. October 2023, 19:14) | 136 | 97 % |
| Das Prinzip der Polarität by tuace (on 3. September 2017, 17:16) | 25 | 96 % |
| A 38 III (toroidal) by tuace (on 28. October 2017, 13:19) | 25 | 99 % |
| Miracle Clones [Tribute to Botaku] by Undar_Beyond (on 10. November 2020, 20:34) | 33 | 91 % |
| Japanese Sums Cave Cipher - KNT by ONeill (on 27. August 2024, 12:49) | 29 | 99 % |
| Cavino Wisteria by PrimeWeasel (on 9. November 2024, 09:48) | 30 | 100 % |
| Chaos Construction: Summon by Myxo (on 1. March 2026, 15:03) | 28 | 100 % |
| Missile Command by Xenonetix (on 13. July 2022, 00:44) | 38 | 96 % |
| Friendly X-Sums (Chaos Construction) by thoughtbyte (on 16. July 2022, 23:11) | 43 | 99 % |
| Poison Arrow by FryTheGuy (on 23. April 2021, 20:14) | 34 | 94 % |
| Arrow Forest by PotatoHead21 (on 28. September 2021, 09:51) | 16 | 91 % |
| One piece by lerroyy (on 25. September 2022, 22:48) | 28 | 98 % |
| Eternal Entropy by Mad-Tyas (on 28. September 2022, 12:15) | 36 | 91 % |
| Doomsday Killer Sudoku by bodemeister (on 19. October 2022, 15:50) | 15 | 100 % |
| Nevermore Samurai by Kafkapharnaum (on 4. April 2023, 21:27) | 12 | 100 % |
| Paper Snowflake (Irregular, Killer) by Chefofdeath (on 28. May 2023, 04:46) | 15 | 95 % |
| Secret Kingdoms by SenatorGronk (on 27. March 2024, 17:36) | 29 | 98 % |
