(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 | |
|---|---|---|---|
 | Missile Command by Xenonetix (on 13. July 2022, 00:44) | 37 |  96 % |
| Friendly X-Sums (Chaos Construction) by thoughtbyte (on 16. July 2022, 23:11) | 40 | 99 % |
| Doppelcrypto Japanese Cave by KNT (on 3. October 2023, 18:10) | 47 | 97 % |
| Poison Arrow by FryTheGuy (on 23. April 2021, 20:14) | 33 | 94 % |
| Arrow Forest by PotatoHead21 (on 28. September 2021, 09:51) | 15 | 91 % |
| One piece by lerroyy (on 25. September 2022, 22:48) | 27 | 98 % |
| Paper Snowflake (Irregular, Killer) by Chefofdeath (on 28. May 2023, 04:46) | 14 | 95 % |
| Japanese Sums Cave Cipher - KNT by ONeill (on 27. August 2024, 12:49) | 28 | 99 % |
| Wichtels Rätselsommer 2024 (5): Wätsel-Weihnacht by wichtel (on 29. August 2024, 20:23) | 14 | 95 % |
| Digital Loop by mathpesto (on 22. May 2025, 22:44) | 47 | 96 % |
| Ʈɦᶒ Horoloɠᶖᶙḿ by ViKingPrime (on 2. August 2025, 00:00) | 14 | 100 % |
| There's A Mole In Our Ranks by TripleABattery (on 31. August 2025, 18:03) | 16 | 91 % |
| Wichtels Rätselherbst 2025 (2): Das heiße arktische Klima by wichtel (on 7. October 2025, 20:25) | 12 | 100 % |
| alte karte / ferneiland by aqjhs (on 14. November 2025, 02:34) | 14 | 98 % |
| Thinkies (Miracle Chaos Construction) by purpl (on 12. June 2022, 18:12) | 36 | 98 % |
| Whirlpool by FryTheGuy (on 26. August 2021, 17:16) | 26 | 96 % |
| Pentomino Sudoku by KNT (on 11. June 2022, 17:22) | 46 | 97 % |
| Bizarro-doku (w/ MathGuy_12) by ThePedallingPianist (on 24. October 2025, 21:24) | 26 | 95 % |
| Ten-Oh (10-Lines sudoku) by Qodec (on 21. May 2023, 18:31) | 76 | 97 % |
| Liar Japanese Sums #7 - Ciphered Nurikabe by Niverio (on 1. December 2023, 00:53) | 44 | 100 % |
