(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 | |
|---|---|---|---|
 | Doublarr by ICHTUES (on 9. March 2025, 06:00) | 79 |  98 % |
| Divide and Conquer by ebiggie (on 30. November 2025, 00:10) | 78 | 97 % |
| Kakuro Series 6: Easy as Kakuro by Puzzle_Maestro (on 16. May 2020, 16:15) | 53 | 98 % |
| Snake-Sums Sudoku by Willy Wonka (on 18. September 2020, 17:40) | 44 | 99 % |
| Battle With The Archers 13: Unlucky Encounter by Playmaker6174 (on 27. August 2021, 19:14) | 37 | 96 % |
| Microchip by wooferzfg (on 23. July 2022, 02:19) | 39 | 97 % |
| Entropy Sweeper by tesseralis (on 30. September 2023, 22:40) | 75 | 96 % |
| Lonely Killers by Yawnus (on 11. March 2024, 12:14) | 110 | 97 % |
| Hot Spot by juggler (on 21. August 2024, 09:35) | 69 | 97 % |
| Airlocks (Pentominous) by Gliperal (on 17. May 2021, 01:04) | 31 | 92 % |
| The Graveyard Of Schrödinger by fjam (on 25. September 2023, 18:11) | 90 | 97 % |
| Mystery Room Somedoku by blackjackfitz (on 18. August 2024, 15:01) | 35 | 92 % |
| Six Hit Wonder by marty_sears (on 12. November 2025, 23:41) | 208 | 98 % |
| Miami by zetamath (on 28. May 2023, 20:49) | 56 | 100 % |
| Lazy River (w/ Nordy) by mathpesto (on 8. February 2024, 18:27) | 76 | 96 % |
| Toroidaler Kosmos by usp (on 27. February 2015, 00:00) | 23 | 92 % |
| Morgen ist Ostern by ibag (on 26. March 2016, 05:00) | 26 | 97 % |
| Thermo's Adea by PotatoHead21 (on 30. April 2022, 23:07) | 24 | 92 % |
| Icing disaster (Region sum lines/X-sums) by dumediat (on 30. June 2023, 22:38) | 70 | 93 % |
| Night on the Galactic Railroad by sfushidahardy (on 19. August 2024, 00:04) | 27 | 96 % |
