(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 2022 (1): Die Neue Karte von Krakatau by wichtel (on 22. June 2023, 08:08) | 13 |  98 % |
| Ban it twice! (Yin Yang, Renban) by Paletron (on 17. August 2023, 22:41) | 13 | 98 % |
| Ichidoku [Ichimaga/Sudoku Hybrid, Region Sum Lines] by Malrog (on 29. September 2023, 18:45) | 13 | 98 % |
| Assassins by The Book Wyrm (on 8. November 2023, 00:14) | 13 | 100 % |
| Fillmat-doku by yttrio (on 12. January 2024, 21:48) | 35 | 98 % |
| Killer Construction by ahaupt (on 12. June 2020, 21:33) | 58 | 100 % |
| Two stealth bombers crashing into each other, with tea sandwiches by clover (on 1. December 2020, 20:07) | 25 | 96 % |
| Houston by ICHTUES (on 5. September 2021, 06:00) | 22 | 91 % |
| Prism Redux by SeaOtter417 (on 2. November 2022, 15:47) | 31 | 91 % |
| Venomous Snakes by lepton (on 2. February 2023, 16:27) | 33 | 99 % |
| Above Thy Neighbour by marty_sears (on 20. June 2023, 19:20) | 26 | 91 % |
| Schrödinger 303: S-Duality by ViKingPrime (on 9. September 2024, 17:30) | 23 | 91 % |
| Quadstruction by Oddlyeven (on 7. May 2023, 21:25) | 57 | 98 % |
| Magnetplatten-Tausch-ABCtje (2) by ibag (on 27. March 2013, 00:00) | 30 | 98 % |
| #sudoku by matt383 (on 26. October 2021, 21:08) | 33 | 96 % |
| Whispering Tapa-logy by yttrio (on 19. January 2024, 22:10) | 31 | 97 % |
| Pointing parodies by someguy209 (on 21. September 2024, 04:35) | 36 | 91 % |
| Bouquet by Myxo (on 15. September 2023, 10:41) | 84 | 98 % |
| Siamese Coral (1) by KNT (on 6. March 2023, 02:36) | 48 | 100 % |
| Encaged Kropki #2 - oops! no cage totals! by RockyRoer (on 21. October 2020, 00:00) | 21 | 99 % |
