(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 | |
|---|---|---|---|
 | Polymorphic Rooms (collab with yttrio) by Bellsita (on 6. August 2023, 02:40) | 115 |  98 % |
| Stolen Numerals XVII by NurglesGift (on 15. July 2024, 16:24) | 110 | 96 % |
| Woof! by zegres (on 1. August 2022, 07:13) | 75 | 97 % |
| Synergies by Playmaker6174 (on 1. December 2024, 04:00) | 55 | 95 % |
| Advent Calendar by Bearded Fool (on 1. December 2024, 12:00) | 92 | 97 % |
| Toroidales Tapasyu 2 by usp (on 25. October 2014, 00:00) | 58 | 98 % |
| Canadian Whispers by Mojo872 (on 15. December 2021, 07:13) | 55 | 96 % |
| Double Dragon (ft. Piatato) by Nordy (on 3. December 2022, 08:00) | 51 | 97 % |
| The Door around the Corner by XeonRisq (on 16. July 2023, 20:00) | 122 | 98 % |
| Thermo Sudoku by Realshaggy (on 26. May 2020, 22:31) | 91 | 94 % |
| The Butterfly Effect - Region Sum Lines Sudoku by Mr.Menace (on 28. February 2022, 20:11) | 102 | 97 % |
| Astronomic Squares Sudoku by Philipp Huber (on 7. August 2020, 10:35) | 27 | 90 % |
| Slingshot Sudoku - Confrontation by stephane.bura (on 26. August 2020, 20:00) | 27 | 96 % |
| Taco Bowl 2 - More Meat by DiMono (on 14. March 2021, 19:30) | 30 | 98 % |
| Singularity Fever [Thermo] by Miky (on 14. June 2021, 20:47) | 30 | 96 % |
| 159² by Sktx (on 2. September 2021, 01:17) | 27 | 94 % |
| Diversity Killer by Migu (on 4. June 2023, 00:36) | 33 | 96 % |
| MILCHPRODUKT - Buchstabenrätsel / Letter Puzzle by DocLogic (on 6. October 2023, 13:56) | 30 | 97 % |
| Zerteilter Rundweg (4) by BFaw (on 9. October 2012, 10:00) | 36 | 92 % |
| "21" Partial Killer by Djmelee3000 (on 17. September 2020, 22:31) | 40 | 95 % |
