(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 | |
|---|---|---|---|
 | Odd Looking by ChinStrap (on 1. April 2026, 19:20) | 37 |  92 % |
| LM 2018 Countdown: Roller Coaster (3) by Uhu (on 31. May 2018, 10:06) | 68 | 96 % |
| Nightfall (German Whisper combo) by Playmaker6174 (on 22. October 2022, 22:29) | 73 | 96 % |
| ▚▚ Summing-Zipper-Loop ▞▞ by ElChiglia (on 2. March 2024, 07:15) | 34 | 94 % |
| Up To N-igma (with Matt Tressel) by ChinStrap (on 5. June 2025, 15:56) | 31 | 96 % |
| Lupin's Loop 1 - No Shared Factors by Rab3aron (on 13. May 2026, 12:45) | 68 | 97 % |
| Do Androids Dream of Electric Sheep? by Abdul the Killer (on 21. May 2024, 12:34) | 93 | 99 % |
| My Zipper is Broken by marty_sears (on 26. February 2024, 14:53) | 132 | 98 % |
| Killer sudoku 2011 - 2012 by Richard (on 31. December 2011, 13:00) | 77 | 93 % |
| Kropki Placement Sudoku #2 by udukos (on 24. November 2020, 10:27) | 26 | 92 % |
| Islands by SamuPiano (on 7. December 2021, 04:52) | 52 | 98 % |
| Loads-N-Kayo by djorr (on 4. July 2022, 14:00) | 26 | 97 % |
| Masyudoku (Masyu/Latin Square/Loop Sums/Ambiguity) by dumediat (on 30. September 2022, 02:35) | 24 | 95 % |
| Pinball Wizard by Blobz (on 28. November 2022, 16:00) | 30 | 93 % |
| Convection Currents by ThePedallingPianist (on 20. May 2025, 15:16) | 29 | 91 % |
| Flexible Killer by Neb (on 6. June 2025, 10:57) | 57 | 94 % |
| Polysemy (Castle wall/Masyu/Knapp daneben) by dumediat (on 23. August 2025, 13:56) | 28 | 100 % |
| 45 Different Numbers by billybeth (on 3. October 2025, 10:26) | 31 | 95 % |
| Lodestar by NicoD (on 22. February 2026, 05:30) | 31 | 92 % |
| Different Differences by marty_sears (on 21. October 2023, 19:43) | 138 | 94 % |
