(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 | |
|---|---|---|---|
 | Arrow Sudoku X - Third time's the charm by udukos (on 3. April 2021, 21:26) | 53 |  96 % |
| Mosaic cogs [Extended diagonal XV - virtual sudoku] by SimplePurpleFrog (on 2. November 2021, 04:05) | 26 | 100 % |
| Five Stories by SSG (on 6. January 2022, 07:15) | 25 | 94 % |
| Arrow City by PotatoHead21 (on 18. January 2022, 20:32) | 44 | 95 % |
| Conundrum by Andrewsarchus (on 18. October 2022, 05:46) | 21 | 97 % |
| Double Rank by Andrewsarchus (on 5. November 2022, 17:39) | 19 | 98 % |
| Anti-Knight Weirdity 5 by Jeet Sampat (on 25. February 2023, 20:19) | 56 | 94 % |
| Cave Battle (15x15) by Jesper (on 20. March 2023, 16:00) | 48 | 99 % |
| Fourberie by ViKingPrime (on 26. May 2023, 13:30) | 31 | 96 % |
| Meidjuluk Star Battle by Grausbert (on 19. June 2023, 15:30) | 26 | 96 % |
| Renber Whispan #2 by Sktx (on 8. August 2023, 11:49) | 33 | 96 % |
| Excavation (arrows) by ZeroUltra (on 10. August 2023, 21:15) | 19 | 92 % |
| Ichidoku [Ichimaga/Sudoku Hybrid, Region Sum Lines] by Malrog (on 29. September 2023, 18:45) | 17 | 97 % |
| Zadra by IcyFruit (on 14. March 2024, 15:55) | 73 | 95 % |
| Battleship Lighthouse Hashikabe by Nell Gwyn (on 2. June 2024, 05:10) | 17 | 97 % |
| Striped snake (halvers and doublers) by Lizzy01 (on 23. May 2025, 14:06) | 29 | 94 % |
| Chaotic Addition by Manta-Ray (on 7. October 2024, 13:09) | 22 | 94 % |
| LUSTIG - großes Buchstabenrätsel / big Letter Puzzle by DocLogic (on 24. September 2025, 17:09) | 23 | 97 % |
| This Bottle's Full (Wraparound, Full Rank) by DubiousMobius (on 2. April 2026, 20:53) | 22 | 91 % |
| Denver by ICHTUES (on 17. July 2022, 06:00) | 124 | 96 % |
