(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 | |
|---|---|---|---|
 | Toroidal Snake - etwas verkürzt by lupo (on 4. February 2018, 23:53) | 21 |  94 % |
| Past Midnight by Selsted (on 20. October 2020, 17:57) | 22 | 97 % |
| Three Arrows by Onion Suit (on 5. May 2021, 02:31) | 24 | 94 % |
| Wave Sudoku by Vebby (on 26. May 2021, 19:06) | 18 | 95 % |
| Diamonds by abed hawila (on 6. June 2021, 17:16) | 20 | 96 % |
| Forwards & Backwards by zetamath (on 12. July 2021, 23:43) | 45 | 93 % |
| Kropki-Arrow Party by abed hawila (on 6. November 2021, 09:40) | 40 | 98 % |
| Norinori Castle Wall by SudokuExplorer (on 11. March 2022, 17:30) | 20 | 94 % |
| Rounded Repulsion by Qril (on 9. June 2022, 02:04) | 21 | 96 % |
| Battle With The Archers 36 - Dual Puzzles: Directional Intuition by Playmaker6174 (on 24. September 2022, 11:27) | 19 | 94 % |
| Pentominous Sum Lines by Xendari (on 19. October 2023, 23:22) | 59 | 97 % |
| Catch The Zippersnake by marty_sears (on 8. January 2024, 01:41) | 112 | 97 % |
| Camouflage (Loop Sum Sudoku) by Agent (on 9. July 2024, 09:00) | 21 | 99 % |
| Taste The Rainbow by Bearded Fool (on 22. November 2024, 12:00) | 23 | 91 % |
| Downtown Circle by Ridhwan (on 4. December 2024, 16:43) | 22 | 99 % |
| Schrödinger's Killer by starwarigami (on 16. December 2021, 05:20) | 66 | 98 % |
| 2many arrows spoil the box by tesseralis (on 27. August 2022, 07:31) | 98 | 96 % |
| Polka Dot by PotatoHead21 (on 26. March 2023, 18:47) | 101 | 95 % |
| Shiny (Cave; Suguru/Fillomino) by MaizeGator (on 27. August 2024, 04:34) | 48 | 95 % |
| XX Sandwich by Tomatenalat (on 15. September 2024, 11:46) | 100 | 96 % |
