(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 | |
|---|---|---|---|
 | Shikaku Killer by Ennead (on 18. February 2025, 20:18) | 101 |  95 % |
| Valence by zetamath (on 12. August 2021, 19:08) | 60 | 96 % |
| Perfect Squares by ICHTUES (on 23. January 2022, 06:00) | 22 | 91 % |
| Which is Which, Again? by DJV (on 22. February 2023, 05:02) | 46 | 95 % |
| Loses Kalenderblatt April 2019 (1/2) by April (on 1. April 2019, 00:00) | 28 | 95 % |
| A Quiet Place by Crusader175 (on 15. July 2022, 18:00) | 27 | 96 % |
| Slingshot Whisper Loop by yttrio (on 14. June 2025, 01:56) | 57 | 98 % |
| Irregular Migraine No7 by TinkerTroy (on 1. May 2023, 03:37) | 41 | 95 % |
| Elephants & Castles by juggler (on 1. July 2024, 12:50) | 77 | 97 % |
| Overlap (Run-On Renbans) by Skunkworks (on 8. September 2022, 17:38) | 61 | 98 % |
| A Meandering Path by 10feet (on 6. July 2021, 06:11) | 35 | 94 % |
| Two Faced Coin - Doubling Lines Twist by purpl (on 16. September 2021, 17:59) | 15 | 92 % |
| Overfull by Jay Dyer (on 13. February 2022, 21:07) | 45 | 91 % |
| PrimeChip by WhatsWrong (on 22. July 2023, 13:14) | 28 | 96 % |
| Beehive [Hexagonal Akari RGB] by wisty (on 27. December 2023, 02:16) | 17 | 96 % |
| The Roc's Shadow (Zippular Lines #3) by heliopolix (on 27. December 2023, 16:22) | 42 | 93 % |
| Hesperia (Beachcomber) by dumediat (on 21. February 2024, 16:17) | 28 | 95 % |
| Roman Somedoku by StartUp21 (on 23. March 2024, 04:06) | 19 | 92 % |
| AUTOR - Buchstabenrätsel / Letter Puzzle by DocLogic (on 13. March 2025, 15:38) | 24 | 95 % |
| 2 Corners by apete (on 1. November 2025, 00:30) | 17 | 92 % |
