(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 | |
|---|---|---|---|
 | Cartesian Sums: An introductory puzzle by damasosos92 (on 2. December 2025, 23:51) | 21 |  97 % |
| Line Items by ebiggie (on 9. December 2025, 00:06) | 30 | 91 % |
| Set Apart by WEBthe3rd (on 9. December 2025, 19:15) | 19 | 92 % |
| Crossroads 2: Attack of the Combs by JeffWajes (on 19. December 2025, 11:13) | 14 | 93 % |
| Echo Chamber (Counting Circles + Cave Shading) by Allagem (on 24. December 2025, 04:32) | 37 | 96 % |
| Budowa (Chaos Construction, Kreska) by Crusader175 (on 4. January 2026, 12:00) | 103 | 97 % |
| Cave Panem (Anti-XV Sandwich) by Phistomefel (on 27. February 2022, 07:22) | 155 | 97 % |
| Sunblock by Kaktuslav (on 30. January 2026, 08:00) | 149 | 97 % |
| Underling by jwsinclair (on 9. January 2026, 22:57) | 140 | 94 % |
| Stickiest Notes by jwsinclair (on 24. January 2026, 22:00) | 127 | 97 % |
| Creepy Crawly (Killer Sudoku) by Phistomefel (on 28. February 2023, 07:35) | 120 | 97 % |
| Wrench Heads (Chaos Construction) by Agent (on 26. May 2022, 09:00) | 112 | 98 % |
| Stepping Stones by grkles (on 10. July 2024, 18:05) | 105 | 99 % |
| I'll Cry If I Want To by FullDeck-Missing (on 30. March 2023, 16:32) | 133 | 95 % |
| Liar Japanese Sums #1 by Niverio (on 21. December 2022, 18:27) | 95 | 99 % |
| Xaos by grkles (on 2. December 2022, 13:41) | 94 | 98 % |
| Schrödinger Somedoku by gdc (on 7. May 2024, 12:35) | 95 | 98 % |
| Pixel Art by Twan2797 (on 11. October 2023, 09:14) | 98 | 94 % |
| Quadrarrows by Jay Dyer (on 11. May 2024, 23:02) | 87 | 98 % |
| From pillar to post - (Killer, Diagonal sudoku) by Mr.Menace (on 30. November 2023, 19:48) | 95 | 95 % |
