(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 | |
|---|---|---|---|
 | 9-Region Thermometers: An Extreme Limitations Puzzle by Md88keys (on 12. July 2025, 21:48) | 115 |  95 % |
| Zerteilter Rundweg (4) by BFaw (on 9. October 2012, 10:00) | 37 | 92 % |
| Known Unknowns (159 killer) by Chilly (on 27. October 2021, 11:12) | 39 | 97 % |
| Clasped Cages by Cane_Puzzles (on 5. December 2021, 17:14) | 37 | 94 % |
| Schlangennest — mal anders by glum_hippo (on 19. March 2022, 16:57) | 45 | 96 % |
| Squiggles (Grkles Collab) by Niverio (on 15. June 2022, 00:37) | 38 | 97 % |
| Minister of Primes (featured on CtC) by Mountainfarmer (on 6. August 2022, 11:19) | 38 | 94 % |
| Double Decker Sandwiches by RockyRoer (on 19. November 2022, 12:58) | 39 | 94 % |
| Killer ratio by jcgodart (on 23. October 2024, 09:38) | 35 | 92 % |
| Toroidales Tapasyu 2 by usp (on 25. October 2014, 00:00) | 59 | 98 % |
| Double Dragon (ft. Piatato) by Nordy (on 3. December 2022, 08:00) | 52 | 97 % |
| Shrug by zetamath (on 15. December 2022, 16:33) | 118 | 97 % |
| Thermoconstrictor by HalfBakedLunatic (on 27. October 2023, 19:20) | 67 | 92 % |
| A Bigger Squish by marty_sears (on 18. December 2023, 17:35) | 56 | 95 % |
| Center of Attention (Qodec's Tribute Puzzle) by Playmaker6174 (on 4. November 2022, 09:42) | 79 | 97 % |
| Thermoregulators by SSG (on 4. April 2025, 05:52) | 93 | 95 % |
| PYRAMIDE - Buchstabenrätsel / Letter puzzle by DocLogic (on 3. February 2020, 18:21) | 38 | 95 % |
| Dense Populations by Mark Sweep (on 5. March 2021, 10:00) | 22 | 97 % |
| A + N ∞ (Palindrome + kropki sudoku) by Aspartagcus (on 16. July 2021, 00:02) | 21 | 97 % |
| Battle With The Archers - The 14th Target: Archer's Illusion by Playmaker6174 (on 2. September 2021, 16:13) | 41 | 97 % |
