(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 | |
|---|---|---|---|
 | Santa Pesto, Pt. 2 (9x9) by SamuPiano (on 27. December 2023, 18:44) | 17 |  97 % |
| Sight Lines Sum (Yin Yang) by palpot (on 15. May 2024, 21:00) | 42 | 96 % |
| Sarajevo Streets - Bosnian Road Sudoku by Mr.Menace (on 5. August 2024, 09:16) | 18 | 93 % |
| Copycat Choco Banana by Scojo (on 6. August 2024, 01:46) | 18 | 98 % |
| One Look Could Kill by yttrio (on 23. November 2024, 01:54) | 76 | 94 % |
| dear puzzle friend by aqjhs (on 14. February 2025, 06:06) | 62 | 95 % |
| how many entropea puzzles can they be? by aqjhs (on 14. July 2025, 02:13) | 37 | 96 % |
| Sandwiched XV Squishmates by SennyK (on 30. December 2025, 23:19) | 25 | 93 % |
| RAT RUN 23: Notable Differences by marty_sears (on 28. January 2026, 02:00) | 585 | 98 % |
| Chaos Shikaku by KNT (on 30. May 2022, 03:26) | 50 | 98 % |
| U-Bahn by Piatato (on 14. August 2023, 10:54) | 50 | 98 % |
| House of Cards (6x6) by jwsinclair (on 14. December 2025, 23:17) | 57 | 91 % |
| Wichtel 2021 (9): Tapa-Doppelstern by wichtel (on 26. October 2022, 20:12) | 32 | 95 % |
| Landvermessung U-Bahn #1 by The Book Wyrm (on 4. April 2024, 21:40) | 34 | 97 % |
| Xtravaganza (S-Cell XV Sudoku X) by tallcat (on 26. October 2022, 09:00) | 51 | 98 % |
| Inverted Killer by NurglesGift (on 17. October 2024, 19:01) | 58 | 93 % |
| Loop Limit by marty_sears (on 24. September 2023, 13:49) | 142 | 97 % |
| Castle Wall Fillomino by Agent (on 21. March 2023, 09:00) | 70 | 97 % |
| Schlingerpfad 000217 by adam001 (on 3. July 2012, 21:25) | 15 | 92 % |
| Killer Stern by tuace (on 6. February 2014, 19:30) | 48 | 98 % |
