(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 | |
|---|---|---|---|
 | Wichtel 2018 (10): HaHeHiHoHoHu by wichtel (on 7. February 2020, 18:20) | 38 |  100 % |
| Carrousel - (Little) Killer / Sandwich Sudoku by SlowLarry (on 23. August 2020, 21:32) | 30 | 96 % |
| A Lying Stars Mystery Killer by Djmelee3000 (on 24. September 2020, 21:07) | 29 | 98 % |
| Position Sums (Odd-even coded) by Realshaggy (on 5. February 2021, 12:00) | 42 | 98 % |
| Multi-sudoku: Orb by DiMono (on 9. April 2021, 16:38) | 38 | 98 % |
| Eine Handvoll U-Bahnen (Teil 4) - Relationen by Zzzyxas (on 18. February 2022, 22:50) | 47 | 99 % |
| Shrek's Sums by twototenth (on 8. March 2022, 08:00) | 19 | 95 % |
| Urban Renewal (11x11 deconstruction) by jwsinclair (on 24. May 2022, 21:25) | 56 | 96 % |
| Battle With The Archers 33: Between Friends and Enemies (part 3) by Playmaker6174 (on 21. June 2022, 08:52) | 31 | 97 % |
| Fibonacci Fountain by Malrog (on 22. June 2022, 20:02) | 16 | 97 % |
| Cubic Doublers by Blobz (on 7. November 2022, 16:00) | 44 | 93 % |
| Squeeze by JamesCullum (on 6. March 2023, 23:36) | 24 | 98 % |
| Skyscraper Thermos by dennischen (on 28. March 2023, 19:48) | 26 | 96 % |
| Bloodsuckers by ViKingPrime (on 8. April 2023, 12:00) | 21 | 92 % |
| Mods & Quads by marty_sears (on 14. October 2023, 00:11) | 83 | 93 % |
| 2024 by starwarigami (on 31. December 2023, 00:00) | 65 | 96 % |
| Zodiac (Cipher Japanese Sums Deconstruction) by tallcat (on 6. May 2024, 08:00) | 50 | 94 % |
| Enigma Sequence by XeonRisq (on 31. August 2024, 20:00) | 20 | 95 % |
| Campobasso (XY-Difference-Paare) by glum_hippo (on 1. October 2024, 15:33) | 18 | 92 % |
| Roman Architecture by Scruffamudda (on 15. October 2024, 06:42) | 56 | 94 % |
