(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 | |
|---|---|---|---|
 | Loses Kalenderblatt April 2019 (1/2) by April (on 1. April 2019, 00:00) | 28 |  95 % |
| Snowflake by kuraban (on 31. December 2021, 00:38) | 32 | 98 % |
| A Quiet Place by Crusader175 (on 15. July 2022, 18:00) | 27 | 96 % |
| Modulate the Thermostat by FullDeck-Missing (on 26. July 2022, 20:53) | 36 | 92 % |
| AUTOR - Buchstabenrätsel / Letter Puzzle by DocLogic (on 13. March 2025, 15:38) | 26 | 95 % |
| Shikaku Killer by Ennead (on 18. February 2025, 20:18) | 105 | 95 % |
| Irregular Migraine No7 by TinkerTroy (on 1. May 2023, 03:37) | 42 | 95 % |
| Doppel-renbän-ger by Manta-Ray (on 6. December 2025, 14:34) | 42 | 96 % |
| Bouquet of Poppies by Sotehr (on 17. January 2025, 10:00) | 48 | 90 % |
| LM 2018 Countdown: Japanisches Summen-Masyu by Uhu (on 7. June 2018, 09:06) | 48 | 97 % |
| Overlap (Run-On Renbans) by Skunkworks (on 8. September 2022, 17:38) | 61 | 98 % |
| Gerade-Ungerade-Killer III by Realshaggy (on 17. September 2013, 11:31) | 86 | 95 % |
| 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) | 46 | 91 % |
| Twix by ICHTUES (on 2. October 2022, 06:00) | 16 | 91 % |
| PrimeChip by WhatsWrong (on 22. July 2023, 13:14) | 28 | 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 % |
| Mini Suguru Pentominoes by Chefofdeath (on 19. March 2024, 01:59) | 31 | 93 % |
| Roman Somedoku by StartUp21 (on 23. March 2024, 04:06) | 19 | 92 % |
