(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 | |
|---|---|---|---|
 | Time by lerroyy (on 13. January 2023, 19:26) | 20 |  92 % |
| Roman Hieroglyph by lepton (on 17. January 2023, 17:20) | 27 | 96 % |
| Symphony (Entropy Killer) by Mad-Tyas (on 6. February 2023, 08:28) | 38 | 97 % |
| O'Position [Ciphered Position Sums Fillomino] by Christounet (on 30. April 2023, 22:51) | 22 | 99 % |
| Information Paradox (Advanced Black Hole) by heliopolix (on 6. May 2023, 01:38) | 23 | 100 % |
| Thinking in Circles by Mennoo_ (on 22. June 2023, 11:34) | 23 | 93 % |
| Surgical Excision by HalfBakedLunatic (on 1. July 2023, 05:02) | 44 | 96 % |
| Impossible Objects by tesseralis (on 8. September 2023, 07:40) | 40 | 98 % |
| Monster Math by ThePedallingPianist (on 26. October 2023, 02:40) | 31 | 100 % |
| Desert Deity by DadJokes (on 1. December 2023, 19:43) | 38 | 95 % |
| Galactic Union (Killer / Spiral Galaxy / Chaos Construction) by Tacosian (on 23. December 2023, 23:26) | 96 | 99 % |
| The 12 Pentominoes of Christmas (Chaos) by DadJokes (on 8. January 2024, 15:19) | 28 | 100 % |
| Giraffe Hunt by ralphwaldo1 (on 10. February 2024, 21:13) | 28 | 90 % |
| Shady Fillomino by Agent (on 18. June 2024, 09:00) | 45 | 99 % |
| Afar by Andrewsarchus (on 28. June 2024, 08:57) | 18 | 93 % |
| Ripples by the_cogito (on 6. September 2024, 17:54) | 14 | 92 % |
| 2 Corinthians 4:18 (Aqre Anti-X-Sum Chaos Deconstruction) by MaizeGator (on 18. September 2024, 01:43) | 28 | 95 % |
| Arcade (Pentopia + Simple Loop) by sfushidahardy (on 17. November 2024, 01:03) | 32 | 97 % |
| Frame Product Sandwich by RockyRoer (on 1. March 2025, 20:49) | 32 | 94 % |
| Mictēcacihuātl (Castle Wall Delta + Directed U-Bahn) by sfushidahardy (on 22. May 2025, 08:11) | 23 | 99 % |
