(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 | |
|---|---|---|---|
 | Asterias (Pentopia U-Bahn) by MaizeGator (on 22. July 2025, 05:19) | 28 |  96 % |
| Rundweg Family Photo by pokerke (on 14. February 2011, 00:57) | 83 | 99 % |
| Implications of Parity by Niverio (on 30. July 2022, 13:06) | 55 | 98 % |
| Who Knows Where the Time Goes by juggler (on 28. December 2024, 07:50) | 61 | 96 % |
| Ma'at's Transcript: Order from Chaos (Chaos Construction) by Chilly (on 13. July 2022, 13:07) | 90 | 100 % |
| Chained killer sudoku no. 3 by Shinya (on 23. August 2021, 22:33) | 26 | 99 % |
| Flaschenpost (Nurikabe Cipher Sudoku) by Agent (on 4. October 2022, 09:00) | 60 | 99 % |
| Stroopwafel by pieguy (on 19. October 2023, 23:13) | 29 | 92 % |
| Feeling Six Yet? by oskode (on 27. August 2025, 06:06) | 30 | 93 % |
| Penumbra (Shadow Sums Sudoku) by Feadoor (on 19. June 2025, 10:56) | 35 | 94 % |
| kNights, uNite! by Alphish (on 17. July 2020, 02:33) | 37 | 92 % |
| The 2-Colour Theorem by starwarigami (on 17. February 2023, 08:46) | 65 | 94 % |
| Rätselhausen - cinque relazioni by Statistica (on 1. December 2017, 23:55) | 35 | 97 % |
| Machtwechsel in Rätselhausen by Statistica (on 1. December 2018, 18:18) | 31 | 99 % |
| Why sooo serious ? [2T1L Deconstruction] by Christounet (on 25. April 2024, 22:59) | 33 | 92 % |
| Adventskalender 2023, Türchen 13 - Transparentes Yajilin by Zzzyxas (on 13. December 2023, 07:00) | 41 | 94 % |
| Chaotic Equality by Knickolas (on 8. December 2022, 21:07) | 86 | 98 % |
| Pointing parodies by someguy209 (on 21. September 2024, 04:35) | 42 | 92 % |
| Bodysnatchers by AnalyticalNinja (on 1. October 2024, 20:07) | 124 | 99 % |
| Yin-Yang-Yong by marty_sears (on 13. May 2024, 00:27) | 89 | 96 % |
