(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 | |
|---|---|---|---|
 | Parity Party XXII, "Party Hearty" by glum_hippo (on 4. January 2022, 04:19) | 43 |  99 % |
| LYLY (double arrows) by Samish (on 5. October 2022, 09:09) | 21 | 94 % |
| Yin Yang Yung by Big Tiger (on 5. December 2022, 23:52) | 19 | 99 % |
| Disam Bonkers by ICHTUES (on 1. January 2023, 06:00) | 21 | 96 % |
| Red Bubbles by antiknight (on 12. April 2023, 22:35) | 26 | 92 % |
| Why-Why? by SennyK (on 22. November 2025, 17:15) | 27 | 97 % |
| Permutation City by juggler (on 20. January 2026, 09:47) | 53 | 96 % |
| Copycat Sausage by Scojo (on 29. March 2026, 08:39) | 26 | 93 % |
| Chaos Construction: Minesweeper by Phistomefel (on 29. March 2021, 13:28) | 103 | 98 % |
| Strange Loop by Andrewsarchus (on 28. September 2021, 16:33) | 50 | 98 % |
| A Game of Battleship! by Niverio (on 14. August 2022, 23:04) | 46 | 100 % |
| Productivity Killer (BYOK+) by SeveNateNine (on 18. October 2023, 02:45) | 62 | 95 % |
| 2 Corinthians 4:18 (Aqre Anti-X-Sum Chaos Deconstruction) by MaizeGator (on 18. September 2024, 01:43) | 34 | 96 % |
| Janus (Chiaroscuro + U-Bahn) by sfushidahardy (on 15. May 2025, 01:25) | 31 | 96 % |
| Fillomino 77 by Myxo (on 1. August 2023, 13:15) | 40 | 97 % |
| Kodama by zetamath (on 20. January 2022, 04:32) | 51 | 96 % |
| Rubber Bullets (10x10 Chaos Construction) by the_cogito (on 27. September 2022, 15:39) | 46 | 99 % |
| Skycagers (Build Your Own Killer Sudoku) by Agent (on 17. January 2023, 09:00) | 84 | 99 % |
| Unsichtbar Hochhauschaos by Luigi (on 22. November 2010, 12:54) | 37 | 95 % |
| Glass Skyscraper Sudoku(P1) by cdwg2000 (on 21. September 2020, 10:20) | 17 | 96 % |
