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 | |
|---|---|---|---|
![]() | Assembly by juggler (on 7. December 2025, 08:41) | 120 | ![]() 98 % |
![]() | Red Lodge, Montana (Sudoku-Creek Hybrid) by mathpesto (on 24. December 2023, 17:10) | 121 | ![]() 97 % |
![]() | Inner Square Diagonals by Phistomefel (on 12. August 2024, 13:31) | 95 | ![]() 97 % |
![]() | Full Rank Sandwich by RockyRoer (on 5. June 2022, 03:22) | 59 | ![]() 100 % |
![]() | Cave Akari by Mark Sweep (on 4. December 2020, 10:00) | 58 | ![]() 99 % |
![]() | DIY Arrows by sophmayrob (on 15. June 2023, 07:59) | 54 | ![]() 98 % |
![]() | Glyphs #5 by damasosos92 (on 23. February 2023, 23:55) | 52 | ![]() 97 % |
![]() | How Bizarre by Nahileon (on 5. June 2024, 14:42) | 45 | ![]() 96 % |
![]() | Above Thy Neighbour by marty_sears (on 20. June 2023, 19:20) | 57 | ![]() 91 % |
![]() | Chalice (Anti-knight, Thermo) by emmettcito (on 23. April 2021, 19:21) | 48 | ![]() 93 % |
![]() | Nineteen by FryTheGuy (on 29. November 2021, 16:51) | 41 | ![]() 94 % |
![]() | Ballast by wooferzfg (on 29. July 2023, 23:07) | 36 | ![]() 97 % |
![]() | Whispering Tapa-logy by yttrio (on 19. January 2024, 22:10) | 36 | ![]() 97 % |
![]() | Leftovers by ThePedallingPianist (on 16. October 2025, 03:10) | 40 | ![]() 95 % |
![]() | Magnetplatten-Tausch-ABCtje (2) by ibag (on 27. March 2013, 00:00) | 32 | ![]() 98 % |
![]() | Galaxy Lunchboxes by Undar_Beyond (on 21. June 2020, 13:57) | 40 | ![]() 97 % |
![]() | SC24 - Region Sum Lines 2 by kuraban (on 22. November 2022, 19:33) | 37 | ![]() 93 % |
![]() | Millstone by jwsinclair (on 13. June 2024, 20:59) | 77 | ![]() 98 % |
![]() | Building Blocks by grkles (on 2. February 2022, 04:00) | 34 | ![]() 97 % |
![]() | All Directions by Joseph nehme (on 19. February 2022, 07:48) | 33 | ![]() 97 % |