(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 | |
|---|---|---|---|
 | Penumbra (Shadow Sums Sudoku) by Feadoor (on 19. June 2025, 10:56) | 35 |  94 % |
| kNights, uNite! by Alphish (on 17. July 2020, 02:33) | 37 | 92 % |
| The 2-Colour Theorem by starwarigami (on 17. February 2023, 08:46) | 65 | 94 % |
| Split the Sums by palpot (on 4. January 2026, 10:00) | 34 | 98 % |
| Lighthouses by IcyFruit (on 2. October 2025, 12:26) | 123 | 91 % |
| Rätselhausen - cinque relazioni by Statistica (on 1. December 2017, 23:55) | 35 | 97 % |
| Machtwechsel in Rätselhausen by Statistica (on 1. December 2018, 18:18) | 31 | 99 % |
| Why sooo serious ? [2T1L Deconstruction] by Christounet (on 25. April 2024, 22:59) | 33 | 92 % |
| Adventskalender 2023, Türchen 13 - Transparentes Yajilin by Zzzyxas (on 13. December 2023, 07:00) | 42 | 94 % |
| Chaotic Equality by Knickolas (on 8. December 2022, 21:07) | 89 | 98 % |
| Pointing parodies by someguy209 (on 21. September 2024, 04:35) | 42 | 92 % |
| Yin Yang Sandwiches by flutchman (on 4. October 2025, 22:23) | 41 | 95 % |
| Leftovers by ThePedallingPianist (on 16. October 2025, 03:10) | 43 | 95 % |
| The Great Wall by tesseralis (on 9. September 2022, 07:42) | 46 | 98 % |
| Killer Windrad by tuace (on 30. July 2016, 14:45) | 44 | 98 % |
| X Zip Line by antiknight (on 29. November 2023, 19:36) | 54 | 96 % |
| Sudoku Variants Series (373) - Four Winds Killer by Richard (on 1. June 2022, 01:00) | 62 | 93 % |
| Bodysnatchers by AnalyticalNinja (on 1. October 2024, 20:07) | 125 | 99 % |
| Colossal Cave Sudoku by tesseralis (on 28. October 2022, 03:02) | 73 | 99 % |
| Ma'at's Judgement - The Weighing of the Heart (Chaos Construction) by Chilly (on 22. November 2022, 16:58) | 83 | 100 % |
