(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 | |
|---|---|---|---|
 | Disjoint Whispers by abed hawila (on 5. October 2021, 10:47) | 15 |  94 % |
| Crypto Japanese Cave (1) by KNT (on 11. October 2022, 08:04) | 81 | 98 % |
| Killer Sudomino (Killer Sudoku+Fillomino Hybrid) by AnalyticalNinja (on 31. October 2022, 14:08) | 46 | 98 % |
| A New Secret by blackjackfitz (on 6. February 2023, 19:05) | 15 | 98 % |
| Galactic Aquariums (Spiral Galaxy Aquarium hybrid) by AnalyticalNinja (on 17. August 2023, 01:04) | 16 | 96 % |
| Between Friends by Die Hard (on 18. September 2023, 01:29) | 16 | 90 % |
| 200 Streams of Zetatude (Modifiers, Renban, Region Sum, Arrows, Anti-consecutive) by Chilly (on 28. December 2023, 14:25) | 15 | 92 % |
| Overdose by XeonRisq (on 20. February 2024, 23:00) | 27 | 91 % |
| Ophidiophobia by marty_sears (on 14. August 2024, 14:45) | 94 | 97 % |
| Lonely Killers by Yawnus (on 11. March 2024, 12:14) | 108 | 97 % |
| Privy (German Whispers/Renban/Sandwich) by dumediat (on 24. April 2023, 14:06) | 60 | 95 % |
| Critical Mass (Renban Between Lines) by tallcat (on 13. March 2022, 21:18) | 64 | 97 % |
| Hakyuu-Hitori Kombi by pwahs (on 28. June 2011, 11:36) | 49 | 97 % |
| Gerade Ungerade Tapa-Höhle by tuace (on 7. December 2015, 12:20) | 45 | 99 % |
| Killer Sudoku #3 — 'Central Tendency' by PixelPlucker (on 2. January 2022, 05:59) | 44 | 97 % |
| Wasteland [Landvermessung/Chaos Deconstruction] by zzw (on 16. April 2024, 13:26) | 26 | 95 % |
| Re(cursive/entry) by mormagli (on 25. June 2024, 21:03) | 24 | 95 % |
| Cygnus (Kurodoko + Yajilin Amalgam) by sfushidahardy (on 29. October 2024, 04:23) | 26 | 99 % |
| Thou Shalt Pass by Wuschel (on 3. February 2025, 09:39) | 48 | 98 % |
| The Graveyard Of Schrödinger by fjam (on 25. September 2023, 18:11) | 80 | 97 % |
