(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 | |
|---|---|---|---|
 | Several Little Boxes by jsmirob (on 17. November 2022, 04:39) | 34 |  94 % |
| SC25 - Projected Sums by kuraban (on 25. November 2022, 09:32) | 21 | 95 % |
| Pile of 15 (Killer Sudoku) by Cane_Puzzles (on 2. December 2022, 15:51) | 62 | 94 % |
| Castle Wall / Masyu Liars by Agent (on 24. January 2023, 09:00) | 31 | 99 % |
| U-Bahn (1) by KNT (on 15. April 2023, 06:02) | 59 | 96 % |
| Curious Consecutive Snake (by Paws and Ben) by starwarigami (on 19. January 2024, 11:45) | 35 | 98 % |
| Thermo Sudoku by Jeet Sampat (on 17. February 2024, 18:21) | 20 | 90 % |
| Chroma-Some (Killer) by zegres (on 5. March 2024, 05:31) | 42 | 90 % |
| Distorted Reflections by meggen033 (on 10. March 2024, 14:46) | 50 | 93 % |
| RV 315 by BaumJames (on 6. April 2024, 04:54) | 22 | 92 % |
| You want sum? by Maximus (on 19. May 2024, 15:33) | 30 | 96 % |
| Factor Map by ul-Rhymm (on 30. June 2024, 14:57) | 44 | 99 % |
| Take More U-Turns by Black_Doom (on 30. June 2024, 18:39) | 59 | 96 % |
| Trisection by Andrewsarchus (on 16. July 2024, 06:27) | 20 | 94 % |
| Octavia by steelwool (on 20. October 2024, 20:43) | 19 | 91 % |
| Secret Crossing by Groktilian (on 18. November 2024, 07:00) | 41 | 94 % |
| Squishtroquadri Snack Pack by ThePedallingPianist (on 5. December 2024, 12:25) | 29 | 95 % |
| Japanische Krypto-Summen-Trilogie (3) by ibag (on 31. December 2013, 07:00) | 69 | 99 % |
| Different Differences by marty_sears (on 21. October 2023, 19:43) | 105 | 94 % |
| Happy birthday, pin7guin by ibag (on 6. September 2011, 00:00) | 43 | 92 % |
