(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 | |
|---|---|---|---|
 | What are the odds? (Parity killer/little killer) by sujoyku (on 18. August 2023, 10:15) | 38 |  93 % |
| The Electrified Trio by Playmaker6174 (on 26. August 2023, 09:15) | 25 | 99 % |
| Vacaville by glum_hippo (on 16. October 2023, 21:10) | 37 | 90 % |
| Circuit Board [Standard U-Bahn] by wisty (on 14. November 2023, 17:10) | 34 | 99 % |
| Jungle Japes [Indexing Killer Sudoku] by wisty (on 30. November 2023, 23:00) | 11 | 95 % |
| Battle With The Archers 4: Dual Crossbows by Playmaker6174 (on 23. June 2021, 07:57) | 50 | 95 % |
| Rätselmix kryptisch by AI1463 (on 9. July 2015, 00:00) | 32 | 99 % |
| KUCHEN - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 6. January 2020, 11:29) | 34 | 94 % |
| Paradox by Xenonetix (on 5. June 2022, 01:11) | 29 | 98 % |
| Farfalle by cam (on 2. December 2022, 00:25) | 45 | 95 % |
| Naughty Negative Snake by starwarigami (on 6. March 2024, 00:00) | 37 | 91 % |
| Spot the Difference by marty_sears (on 13. December 2023, 03:29) | 102 | 97 % |
| Middle of the Road (Killer) by tallcat (on 13. February 2023, 08:00) | 69 | 97 % |
| Petroglyph by DadJokes (on 7. December 2022, 19:53) | 89 | 98 % |
| U-Bahn mit gemischten Hinweisen (Teil 2) by Zzzyxas (on 28. December 2019, 13:32) | 43 | 99 % |
| Hochhaussummen-Sudoku [5] Killer by Errorandy (on 29. April 2020, 16:00) | 23 | 97 % |
| Killer Sandwich by Alexander Rappa (on 31. October 2020, 19:16) | 45 | 99 % |
| Lend Me Your Eyes by RockyRoer (on 17. November 2020, 01:46) | 23 | 97 % |
| Anti-Springer Killer, "Turfan Fragment" by glum_hippo (on 23. March 2021, 20:14) | 25 | 90 % |
| Time capsule by Testarossa (on 22. September 2021, 15:41) | 23 | 93 % |
