(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 | |
|---|---|---|---|
 | Self-determination 2 by stephane.bura (on 3. November 2022, 14:20) | 17 |  96 % |
| Pastiche by zetamath (on 4. November 2022, 00:18) | 84 | 95 % |
| RemotelyEntropic by Palfly Kampling (on 27. May 2023, 18:52) | 25 | 94 % |
| Diagonal Indexing #1 by EPH (on 5. August 2023, 02:41) | 19 | 93 % |
| Checkered (Psycho Look-and-Say/German whispers/Renban) by dumediat (on 29. August 2023, 16:54) | 13 | 95 % |
| German Summing Doppelganger by feethy (on 3. March 2024, 18:40) | 11 | 100 % |
| SMOG - Buchstabenrätsel / Letter Puzzle by DocLogic (on 4. May 2024, 13:16) | 24 | 94 % |
| Inner Peas by SamuPiano (on 17. July 2024, 15:44) | 46 | 99 % |
| Three's a Crowd by XeonRisq (on 17. July 2024, 02:00) | 11 | 91 % |
| Gemstones by Scojo (on 17. July 2024, 21:29) | 15 | 91 % |
| Sarajevo Streets - Bosnian Road Sudoku by Mr.Menace (on 5. August 2024, 09:16) | 12 | 91 % |
| Widdershins by kuraban (on 25. August 2024, 13:01) | 14 | 93 % |
| Set of Shurikens by SamuPiano (on 20. September 2024, 15:44) | 16 | 95 % |
| Entropy Lockout by Mad-Tyas (on 22. October 2024, 00:01) | 27 | 94 % |
| No Idea by rysmyth240 (on 11. April 2021, 17:13) | 75 | 93 % |
| Vogelscheuche by Myxo (on 21. July 2024, 13:02) | 76 | 94 % |
| To The Skies by Piatato (on 14. October 2021, 22:25) | 58 | 97 % |
| Rorschach (Thermo) by tallcat (on 23. June 2022, 17:06) | 59 | 95 % |
| Super Smashboy by mathpesto (on 24. August 2022, 05:07) | 57 | 97 % |
| Wormholes (Remix) by Nordy (on 14. May 2023, 08:00) | 53 | 97 % |
