(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 | |
|---|---|---|---|
 | Flexible Killer by Neb (on 6. June 2025, 10:57) | 55 |  94 % |
| Differenz X Chaos Sudoku by tuace (on 17. December 2016, 11:03) | 44 | 96 % |
| Doubler RSL by Mad-Tyas (on 8. November 2024, 00:01) | 43 | 93 % |
| Fishing Pentominoes by Agent (on 12. September 2025, 09:00) | 45 | 100 % |
| Cosmic Balance (FoW) by Nurator (on 20. January 2024, 20:16) | 200 | 96 % |
| Rorschach by zetamath (on 12. November 2024, 16:42) | 93 | 95 % |
| LUSTIG - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 27. January 2021, 17:43) | 35 | 95 % |
| King's Guard by Fafrd (on 6. June 2022, 03:49) | 39 | 95 % |
| Profusion (Yin Yang Killer) by troptot (on 14. February 2023, 19:07) | 39 | 94 % |
| U-Bahn 3 by wooferzfg (on 28. June 2025, 06:28) | 38 | 95 % |
| XOV to Cheyenne (0-9 Challenge) by The Bard (on 20. September 2025, 01:01) | 53 | 96 % |
| Patient Zeroes by gdc (on 26. October 2025, 15:38) | 225 | 97 % |
| MasyU-Bahn (Teil 2) by Zzzyxas (on 2. April 2015, 20:35) | 66 | 99 % |
| Squishdomefel by Peter the Dog (on 9. December 2023, 10:22) | 80 | 92 % |
| LM 2018 Countdown: Roller Coaster (3) by Uhu (on 31. May 2018, 10:06) | 67 | 96 % |
| ADVENTSKALENDER - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. December 2022, 14:35) | 32 | 96 % |
| ▚▚ Summing-Zipper-Loop ▞▞ by ElChiglia (on 2. March 2024, 07:15) | 34 | 94 % |
| ON EDGE: Brown & Green by marty_sears (on 9. February 2025, 11:08) | 180 | 97 % |
| Kropki Placement Sudoku #2 by udukos (on 24. November 2020, 10:27) | 26 | 92 % |
| Loads-N-Kayo by djorr (on 4. July 2022, 14:00) | 26 | 97 % |
