(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 | |
|---|---|---|---|
 | Interchangeable by palpot (on 2. April 2024, 00:16) | 23 |  95 % |
| Whispering Snakeban by yanggang (on 26. April 2024, 19:31) | 12 | 100 % |
| Slow Snake Somedoku by blackjackfitz (on 11. July 2024, 05:25) | 25 | 98 % |
| Subway Buddies by Niverio (on 9. August 2024, 13:03) | 25 | 96 % |
| Loose associations (Numbered rooms/Remote sums/Region sum lines) by dumediat (on 6. October 2023, 21:39) | 55 | 93 % |
| Hells Bells by Christounet (on 10. July 2023, 23:15) | 87 | 96 % |
| Happy Birthday, marcmees! by ibag (on 15. August 2020, 00:00) | 13 | 100 % |
| nabneR by zetamath (on 4. July 2021, 17:35) | 64 | 98 % |
| Juosan Parity Parade by kolot (on 9. November 2021, 13:31) | 13 | 98 % |
| Masyup Kakuro by purpl (on 17. March 2024, 22:08) | 17 | 92 % |
| Killer Sudoku - The Cloverleaf by Phistomefel (on 6. September 2020, 13:21) | 86 | 94 % |
| Bizarro Killer by Strosahl (on 12. June 2020, 05:38) | 25 | 98 % |
| Unusual journey of a lonely knight (chaos construction) by filuta (on 16. August 2021, 01:09) | 25 | 97 % |
| Kreuzfahrt by pirx (on 14. April 2018, 18:00) | 32 | 99 % |
| Equality Cages by Big Tiger (on 29. May 2021, 00:24) | 18 | 97 % |
| Myriad of Triad by Tyrgannus (on 18. April 2021, 22:04) | 27 | 93 % |
| Japanese Sums Sudoku - with negatives by RockyRoer (on 4. September 2023, 14:33) | 28 | 97 % |
| Sandwich Sudoku - Find x!!!! Part 4 by ProwlingTiger (on 31. May 2020, 00:45) | 19 | 96 % |
| The Three Bears Sudoku by dance1211 (on 14. October 2020, 03:48) | 19 | 96 % |
| Rank Up 06 - Fibonacci Squishtroquadri by ThePedallingPianist (on 14. July 2024, 01:08) | 20 | 95 % |
