(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 | |
|---|---|---|---|
 | SC26 - Renban 3 by kuraban (on 8. December 2022, 04:30) | 34 |  97 % |
| Killer Battle by 10feet (on 8. December 2022, 05:08) | 16 | 95 % |
| Polyamorous Cages by Ennead (on 11. December 2022, 11:24) | 35 | 94 % |
| Ambiguous Palindrome by Maxentius (on 21. January 2023, 22:23) | 15 | 93 % |
| A New Secret by blackjackfitz (on 6. February 2023, 19:05) | 13 | 98 % |
| Many happy returns (Land survey/Quadruples/Chaos Construction/Cipher) by dumediat (on 10. February 2023, 13:42) | 16 | 98 % |
| Counterclockwise Killer by bodemeister (on 11. February 2023, 15:26) | 18 | 91 % |
| Max Arrows by antiknight (on 3. March 2023, 01:19) | 21 | 94 % |
| Stethoscope by JamesCullum (on 3. March 2023, 02:29) | 13 | 95 % |
| Secret Pressure by Wuschel (on 13. March 2023, 18:53) | 36 | 90 % |
| Clowns and Jokers by Die Hard (on 6. April 2023, 05:48) | 41 | 94 % |
| March of the Palindromes by EricRathbun (on 3. May 2023, 19:15) | 65 | 93 % |
| Framing In The Park by Niverio (on 14. April 2023, 19:33) | 41 | 96 % |
| Corotating Photon Sphere (Black Hole #3) by heliopolix (on 16. April 2023, 08:34) | 22 | 93 % |
| Who Ordered The X-Sums? by RockyRoer (on 19. April 2023, 04:21) | 42 | 98 % |
| Interference (Masyu/Chaos Construction/Cipher) by dumediat (on 22. April 2023, 18:32) | 32 | 96 % |
| Cornerstones [Sum Dot Infinity Loop] by wisty (on 26. April 2023, 22:15) | 13 | 95 % |
| Push Me Pull You by Die Hard (on 29. April 2023, 04:35) | 38 | 97 % |
| Double Dragon 2 by Nordy (on 4. May 2023, 23:10) | 39 | 95 % |
| Corner Market by 99%Sneaky (on 16. May 2023, 16:59) | 42 | 93 % |
