(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 | |
|---|---|---|---|
 | Snake Sum Sudoku 5 by Quarterthru (on 11. July 2020, 20:00) | 25 |  97 % |
| Where are the cage totals? - Odd/Even killer sudoku (#5) by Mr.Menace (on 2. February 2021, 10:12) | 32 | 95 % |
| The Devil's Arrow by PotatoHead21 (on 6. June 2021, 06:51) | 21 | 92 % |
| Thonk? by purpl (on 3. May 2022, 00:26) | 28 | 95 % |
| Self-determination by stephane.bura (on 5. September 2022, 15:46) | 83 | 98 % |
| Disambiguation by Flywinged (on 5. February 2023, 01:07) | 23 | 92 % |
| Fillomino Yajilin (10x10) by ns08 (on 8. May 2023, 00:01) | 23 | 95 % |
| Sea Level Rise Sudoku by MagnusJosefsson (on 31. March 2024, 18:58) | 21 | 98 % |
| .357 Magnum by EricRathbun (on 1. March 2025, 06:33) | 26 | 94 % |
| MGC-1326 [Masyu Star Battle] by Christounet (on 17. July 2024, 23:54) | 30 | 95 % |
| Full Circle by Qodec (on 22. September 2025, 16:15) | 65 | 97 % |
| N is for Naomi by Fool on Hill (on 15. March 2026, 15:16) | 51 | 97 % |
| The Valley by DarthSillious72 (on 31. March 2026, 01:56) | 26 | 94 % |
| Lawful Wrogn by Niverio (on 20. March 2023, 16:33) | 87 | 95 % |
| Japanische Summen mit Hochhauskern - gründlich daneben by ibag (on 27. March 2014, 00:00) | 58 | 100 % |
| Ei8teen by Joseph nehme (on 13. August 2022, 08:19) | 69 | 99 % |
| Doubler XL by thoughtbyte (on 6. September 2023, 00:07) | 63 | 98 % |
| Zum Geburtstag by Uhu (on 9. July 2017, 00:00) | 42 | 98 % |
| Chaos Construction: Sightlines by KNT (on 3. June 2022, 07:40) | 138 | 97 % |
| Friendly Indexing Miracle by thoughtbyte (on 5. June 2023, 18:29) | 43 | 95 % |
