(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 | |
|---|---|---|---|
 | 25/12 by starwarigami (on 26. December 2022, 21:15) | 68 |  90 % |
| Reconstructed Frame by XeonRisq (on 23. March 2023, 20:00) | 33 | 93 % |
| A tangled web (Two truths and a lie) by MattYDdraig (on 17. January 2025, 06:23) | 35 | 94 % |
| A Bit of Thermo Fun by ebiggie (on 19. August 2025, 00:08) | 40 | 93 % |
| Four Sum-Linked Sudokus by Genomico (on 10. September 2020, 21:33) | 54 | 97 % |
| M-Bahn (Modular U-Bahn) by cyddrdrd (on 12. July 2025, 00:00) | 59 | 99 % |
| Michael Palin by starwarigami (on 4. April 2022, 21:18) | 55 | 97 % |
| Straddle by marty_sears (on 26. December 2023, 22:35) | 89 | 96 % |
| Roadmap (Region Sum 159) by tallcat (on 2. December 2022, 15:49) | 88 | 95 % |
| Entangled-2-Way-Sudoku by Rawcoder (on 11. May 2020, 18:07) | 25 | 94 % |
| Sandwich Sudoku--肉夹馍(2) by cdwg2000 (on 12. November 2020, 07:11) | 26 | 90 % |
| I Chased a Polecat Up a Tree (Inequality Series #5) by twototenth (on 5. October 2021, 08:00) | 29 | 91 % |
| Complete Achromatopsia by angel_shaaark (on 5. June 2022, 10:25) | 35 | 95 % |
| Modulate the Thermostat by FullDeck-Missing (on 26. July 2022, 20:53) | 34 | 92 % |
| Orange & Blue by FJL (on 4. December 2022, 15:45) | 26 | 92 % |
| Check the corners by Stoer (on 18. April 2023, 15:13) | 33 | 90 % |
| Chaos Karussell VI by Luigi (on 16. September 2011, 10:15) | 49 | 94 % |
| Colored Groups by Nahileon (on 8. October 2025, 15:50) | 98 | 96 % |
| Gerade Ungerade Koralle by tuace (on 3. November 2013, 18:30) | 64 | 93 % |
| The Mine by FKlauser (on 18. April 2021, 20:30) | 26 | 91 % |
