(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 | |
|---|---|---|---|
 | Super Smashboy by mathpesto (on 24. August 2022, 05:07) | 57 |  97 % |
| Wormholes (Remix) by Nordy (on 14. May 2023, 08:00) | 53 | 97 % |
| Border skirmish (battlefield) sudoku by Nylimb (on 7. June 2020, 03:39) | 42 | 99 % |
| The French Connec7ion by Zombie Hunter (on 20. July 2021, 22:45) | 43 | 97 % |
| X-Sum Skyscraper (hybrid) by GarlicBredFries (on 15. November 2021, 07:53) | 33 | 95 % |
| Silk Road (Aquarium Country Road Fillomino) by Agent (on 7. February 2023, 09:00) | 38 | 100 % |
| Counting Thermos by Scojo (on 17. December 2023, 21:16) | 121 | 97 % |
| Neue Post aus Rätselhausen by Statistica (on 1. December 2015, 00:12) | 48 | 95 % |
| Arrows and a Big X by GBPack (on 17. June 2021, 17:11) | 26 | 96 % |
| Parity Mirror by zegres (on 2. May 2022, 04:41) | 76 | 100 % |
| The Answer by tomate94 (on 4. May 2022, 11:18) | 26 | 95 % |
| Knight Sweats by SlowLarry (on 21. August 2022, 16:26) | 29 | 95 % |
| Jigsaw-doku by jwsinclair (on 3. October 2022, 20:31) | 23 | 98 % |
| Liar Japanese Sums #4 - Ciphered Yin Yang by Niverio (on 1. February 2023, 11:22) | 48 | 99 % |
| Hex-Proof by qoala (on 6. February 2023, 00:15) | 30 | 95 % |
| Cascade by zetamath (on 20. August 2023, 15:43) | 84 | 93 % |
| Good Things Come in Threes [Killer] by 3good5you (on 26. August 2023, 03:27) | 31 | 93 % |
| Distinctiveness by Ridhwan (on 12. February 2024, 00:05) | 25 | 92 % |
| The Juggler [Modular Lines, Kropki Pairs] by Malrog (on 13. March 2024, 13:03) | 25 | 94 % |
| Some Indexing by TVDK (on 24. February 2025, 02:00) | 24 | 96 % |
