(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 | |
|---|---|---|---|
 | Lost Village (Lost and Found #5) by .proxz14 (on 8. March 2025, 13:32) | 158 |  96 % |
| The Engine (Killer sudoku) by sujoyku (on 19. July 2025, 16:54) | 141 | 97 % |
| Suguru Chaos Deconstruction #2: Kropki Edition by mathpesto (on 16. February 2022, 03:51) | 165 | 99 % |
| To The Skies by Piatato (on 14. October 2021, 22:25) | 69 | 97 % |
| Siphon (Region Sum Lines) by tallcat (on 11. August 2022, 08:00) | 128 | 99 % |
| Japanese Sums #3: Reef by Myxo (on 17. May 2023, 21:10) | 62 | 95 % |
| 10:01 AM by CaptZebraCakes (on 10. November 2023, 00:30) | 66 | 96 % |
| Overkill by Jay Dyer (on 24. August 2022, 17:19) | 100 | 98 % |
| Das Krypto-ABC-tje des Außerirdischen by ibag (on 22. August 2012, 14:56) | 31 | 96 % |
| Die Kryptos - S04E06: Kariertes Fillomino (Variante) by tuace (on 21. January 2020, 08:06) | 33 | 98 % |
| Scorpion by udukos (on 1. January 2022, 14:10) | 69 | 95 % |
| Metroid by Kafkapharnaum (on 30. December 2022, 17:24) | 38 | 99 % |
| Corner Piece by pieguy (on 26. February 2023, 21:07) | 36 | 95 % |
| Elementary by igniteice (on 21. December 2023, 02:40) | 41 | 91 % |
| X---V*Parity Quads by NurglesGift (on 18. April 2025, 05:47) | 77 | 97 % |
| Sudoku Boogie Woogie by juggler (on 26. November 2025, 11:37) | 41 | 92 % |
| Zippery When Wet by marty_sears (on 20. November 2023, 03:01) | 192 | 99 % |
| Samurai-Sudoku mit Varianten by Pingu (on 6. December 2019, 02:33) | 61 | 90 % |
| Not too High, Not too Low by Cane_Puzzles (on 18. March 2023, 19:57) | 61 | 96 % |
| Gimme Shelter by glum_hippo (on 29. November 2024, 23:01) | 59 | 95 % |
