(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 | |
|---|---|---|---|
 | Japanese Sums #2: Balance by Myxo (on 26. April 2023, 21:10) | 39 |  97 % |
| Parity Party XX, "Crescendo" by glum_hippo (on 19. June 2021, 01:06) | 32 | 98 % |
| JOKER - Buchstabenrätsel / Letter Puzzle by DocLogic (on 28. April 2023, 14:03) | 32 | 94 % |
| Snake Sum Sudoku 1 by Quarterthru (on 26. June 2020, 16:44) | 32 | 98 % |
| Index-istential Crisis (with ChinStrap) by sujoyku (on 19. January 2025, 13:39) | 27 | 96 % |
| Quintupelblock by ibag (on 17. June 2015, 22:47) | 52 | 97 % |
| Looking for Phisto by EPH (on 22. February 2023, 18:29) | 35 | 93 % |
| Hooligans Underground (Slingshot U-Bahn) by Piatato (on 29. May 2023, 21:21) | 23 | 99 % |
| Chocona Road by mathpesto (on 15. May 2024, 04:57) | 30 | 95 % |
| Arrow Sudoku by abed hawila (on 17. February 2021, 21:51) | 72 | 97 % |
| Laser (1) by Uhu (on 26. October 2020, 10:30) | 21 | 97 % |
| Hungarian Tapa-Like Loop by the_cogito (on 28. April 2023, 19:16) | 24 | 91 % |
| The Sword by Qodec (on 22. November 2020, 19:59) | 69 | 96 % |
| Sudoku Variants Series (310) - Sum Triplets Sudoku by Richard (on 3. March 2021, 00:00) | 65 | 95 % |
| Consecutive Ladder by Cane_Puzzles (on 17. January 2023, 09:33) | 48 | 98 % |
| Delray Beach Sunrise (Yin-YANG Fillomino) by MaizeGator (on 6. August 2024, 04:04) | 65 | 98 % |
| Just One Cells Sudoku(WS+PC2021 Leftover) by cdwg2000 (on 24. November 2021, 06:35) | 25 | 94 % |
| Nonbinairo by mathpesto (on 28. May 2022, 22:53) | 42 | 98 % |
| Lookie Lookie (Doubler/Look-and-say/Renban) by dumediat (on 2. September 2022, 03:53) | 19 | 98 % |
| Cave of Loops by Myxo (on 7. December 2022, 11:52) | 54 | 99 % |
