(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 | |
|---|---|---|---|
 | Messier 43 (Galaxy Region Sum Lines) by purpl (on 1. October 2022, 01:31) | 61 |  99 % |
| Charybdis by Gliperal (on 21. March 2021, 05:46) | 51 | 97 % |
| Rätselhausen - cinque relazioni by Statistica (on 1. December 2017, 23:55) | 34 | 97 % |
| XV Sandwiches by RockyRoer (on 21. November 2020, 04:47) | 34 | 95 % |
| Tentrik Meditation (with mellowrobinson) by sujoyku (on 3. August 2025, 08:29) | 34 | 96 % |
| Summenbild mit Lücken by Calavera (on 1. September 2009, 02:51) | 67 | 96 % |
| Min-Max-Sichtblöcke (3) by BFaw (on 14. December 2016, 10:00) | 18 | 95 % |
| Alley of Arrows by MavericksJD (on 19. April 2021, 13:36) | 38 | 98 % |
| Arrow Logic by PotatoHead21 (on 17. May 2021, 21:03) | 19 | 95 % |
| 8-Color Theorem by the_cogito (on 14. June 2022, 19:10) | 37 | 98 % |
| BYOX by randall (on 11. July 2023, 10:10) | 18 | 92 % |
| Vacancy (Chaos Construction) by thoughtbyte (on 28. August 2023, 06:30) | 74 | 96 % |
| Knight of Chaos by Andrewsarchus (on 4. December 2024, 18:44) | 40 | 98 % |
| I Like Fun (With sujoyku) by Gene The Supreme (on 16. March 2025, 17:37) | 36 | 97 % |
| Signpost Nanro (Aqre) by KNT (on 12. April 2025, 23:06) | 38 | 97 % |
| The Buddy System by Allagem (on 20. June 2024, 07:55) | 80 | 98 % |
| Implications of Parity by Niverio (on 30. July 2022, 13:06) | 54 | 98 % |
| The Sun by EricRathbun (on 2. June 2024, 00:57) | 59 | 90 % |
| Cave Fillomino #1 (10x10) by Jesper (on 29. August 2020, 11:40) | 75 | 100 % |
| Short Arrows by Las4one (on 17. December 2024, 11:16) | 42 | 95 % |
