(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 | |
|---|---|---|---|
 | Broken Square by PotatoHead21 (on 14. August 2021, 08:24) | 24 |  99 % |
| The Chained Trio (Between x Lockout x Double Arrow) by Playmaker6174 (on 19. March 2023, 18:23) | 27 | 95 % |
| Escape Velocity (Arrow/XV) by damo_89 (on 3. June 2025, 22:53) | 71 | 96 % |
| Wichtel 2017 (4): Drei Wichtel und 144 Häuser by wichtel (on 26. May 2018, 07:04) | 37 | 99 % |
| 6 Arrows by Jeet Sampat (on 25. September 2022, 22:46) | 44 | 97 % |
| Crypto Japanese Cave from the Underworld by KNT (on 30. October 2022, 05:29) | 37 | 99 % |
| Doppelgangland (Double Arrow Doublers) by tallcat (on 8. September 2025, 00:00) | 37 | 93 % |
| Detroit by ICHTUES (on 14. November 2021, 06:00) | 51 | 96 % |
| Whispers + Arrows + Renban + Sudoku X by Jeet Sampat (on 14. December 2022, 13:15) | 58 | 96 % |
| Three of Diamonds by zetamath (on 20. February 2023, 16:07) | 57 | 94 % |
| Sprengungen im Hochhausviertel II by tuace (on 18. January 2015, 23:36) | 38 | 98 % |
| The Red and the Black (Anti-King Arrow) by tallcat (on 18. October 2021, 15:41) | 55 | 92 % |
| Swanky Sandwiches [S-Cell Variant Sudoku] by wisty (on 13. October 2022, 23:07) | 16 | 100 % |
| Liar Japanese Sums #3: Renban Square by Niverio (on 8. January 2023, 21:45) | 68 | 98 % |
| Sky-Skyscraper by Phistomefel (on 22. March 2024, 15:29) | 92 | 99 % |
| Don't open the box by sanabas (on 4. July 2024, 15:05) | 16 | 93 % |
| Sorted Subway by KNT (on 22. July 2024, 07:21) | 43 | 96 % |
| Knight of Chaos by Andrewsarchus (on 4. December 2024, 18:44) | 45 | 98 % |
| Top Floor by ThePedallingPianist (on 7. January 2026, 01:20) | 29 | 95 % |
| Thermo Arrow Sudoku by Phistomefel (on 24. May 2021, 04:16) | 96 | 96 % |
