(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 | |
|---|---|---|---|
 | Hunhh? by Joseph nehme (on 7. June 2024, 07:06) | 97 |  95 % |
| Renban shifted x-sums by Lizzy01 (on 20. July 2024, 22:55) | 15 | 93 % |
| Copycat Choco Banana by Scojo (on 6. August 2024, 01:46) | 16 | 98 % |
| Set of Shurikens by SamuPiano (on 20. September 2024, 15:44) | 22 | 96 % |
| Sigma Grindset by Sniglett (on 24. January 2025, 05:52) | 18 | 91 % |
| Enter the Dragon! (Entropic Between Lines) by tallcat (on 14. November 2025, 07:00) | 53 | 93 % |
| One arrow comes to the rescue (Anti-Knight Shading) by galium_odoratum (on 2. December 2025, 20:03) | 20 | 96 % |
| House of Cards (6x6) by jwsinclair (on 14. December 2025, 23:17) | 54 | 91 % |
| Grid Ground Grode by MathGuy_12 (on 4. February 2026, 03:12) | 14 | 91 % |
| YYSL Whispers by Blobz (on 24. April 2023, 16:00) | 101 | 96 % |
| Castle Wall Fillomino by Agent (on 21. March 2023, 09:00) | 68 | 97 % |
| Stolen Numerals XVII-5 by NurglesGift (on 16. January 2025, 16:48) | 85 | 95 % |
| Loop Limit by marty_sears (on 24. September 2023, 13:49) | 135 | 97 % |
| Killer on the Orient Express by ThePedallingPianist (on 9. December 2022, 19:00) | 52 | 98 % |
| Kaboom by mathpesto (on 25. November 2023, 13:51) | 92 | 97 % |
| Visible Chaos by Belamis (on 12. March 2025, 19:15) | 84 | 96 % |
| Japanische Bahnhöfe, Teil 1 by pirx (on 27. May 2020, 13:00) | 30 | 94 % |
| Chaos Construction with Slitherlink clues #1 by Phistomefel (on 20. September 2020, 16:25) | 101 | 96 % |
| Parity Party XII, "Herbst" by glum_hippo (on 11. October 2020, 18:05) | 34 | 97 % |
| Kropki'd X-sums sudoku by Nylimb (on 3. November 2020, 02:50) | 32 | 95 % |
