(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 | |
|---|---|---|---|
 | Re(cursive/entry) by mormagli (on 25. June 2024, 21:03) | 25 |  95 % |
| Slitherbahn by KNT (on 5. August 2024, 09:00) | 49 | 100 % |
| Projected Cave by KNT (on 10. August 2024, 20:16) | 49 | 97 % |
| Repetition Legitimizes (Dynamic FOW) by gdc (on 7. January 2025, 18:59) | 185 | 95 % |
| Crypto Japanese Cave (1) by KNT (on 11. October 2022, 08:04) | 84 | 98 % |
| Prohibitive by jwsinclair (on 9. May 2025, 00:10) | 60 | 94 % |
| Schlangen im Fillomino-Nest III by tuace (on 3. March 2017, 11:24) | 28 | 99 % |
| Rubik's Cube by juggler (on 22. February 2024, 02:25) | 82 | 95 % |
| Six Hit Wonder by marty_sears (on 12. November 2025, 23:41) | 195 | 98 % |
| Arrows and Dots by kolot (on 21. August 2021, 13:12) | 43 | 94 % |
| Mathrax Fillomino by Gliperal (on 28. November 2022, 01:44) | 40 | 96 % |
| Killer Sudoku #3 ('Central Tendency') by PixelPlucker (on 2. January 2022, 05:59) | 47 | 97 % |
| Roller Coaster mit Extras 2 by Uhu (on 5. January 2018, 21:48) | 66 | 99 % |
| Dritter Pfeilchenstrauß by glum_hippo (on 10. September 2020, 22:00) | 23 | 96 % |
| Word Search Sudoku by Stavros96 (on 30. November 2020, 10:06) | 18 | 98 % |
| Why Can't We Be Friends? by SlowLarry (on 21. December 2020, 22:06) | 28 | 98 % |
| Pointing Pairs Fillomino by Mark Sweep (on 16. April 2021, 10:00) | 26 | 98 % |
| Double the Math - Mystery by Mad-Tyas (on 25. May 2021, 07:49) | 18 | 92 % |
| An Homage To Simon by Ronnyson (on 30. August 2021, 11:58) | 19 | 94 % |
| Walking a Nine Line (Chaos Construction) by the_cogito (on 5. February 2023, 16:19) | 43 | 96 % |
