Logic Masters Deutschland e.V.

(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.

DescriptionsolvedRating
unsolvedColossal Cave U-Bahn
by Agent (on 29. April 2025, 09:00)
385
100 %
unsolvedCrystalline Entity
by IcyFruit (on 22. May 2025, 13:23)
645
91 %
unsolvedChaos in the Knighttime
by SenatorGronk (on 5. October 2022, 15:56)
235
99 %
unsolvedParity Party XXV, "Gray's Anatomy"
by glum_hippo (on 29. December 2022, 03:46)
215
96 %
unsolvedBerlin
by zetamath (on 13. March 2023, 04:08)
275
90 %
unsolvedTimes Square (CTC Secret Santa 2023)
by alexc (on 11. March 2024, 01:34)
115
95 %
unsolvedRoller Coaster of Emotions
by Agent (on 25. December 2024, 09:00)
365
100 %
unsolvedSandwich Pseudoku
by starwarigami (on 27. January 2025, 06:43)
125
91 %
unsolvedConstantinoqle (V-Bbhn witg Nestimg Ckues)
by sfushidahardy (on 27. August 2025, 18:54)
125
100 %
unsolvedChaos Construction: Miracle on 81 Cells
by Playmaker6174 (on 17. September 2025, 07:00)
385
98 %
unsolvedShambhala
by IcyFruit (on 20. October 2025, 11:34)
825
96 %
unsolvedU-Bahn Aqre (ft. Christounet)
by cyddrdrd (on 17. January 2026, 00:00)
105
100 %
unsolvedChaos Construction: Aquarium (2)
by KNT (on 23. June 2022, 01:08)
665
98 %
unsolvedArrow/Group Sum Sudoku
by ahaupt (on 10. July 2020, 21:53)
675
99 %
unsolvedFour Alien Theorem (Build Your Own Killer Sudoku)
by Agent (on 7. April 2023, 09:00)
565
99 %
unsolvedPentominous U-Bahn
by KNT (on 17. November 2024, 02:15)
475
95 %
unsolvedSudokuvania: Digits of Despair (v1.1.1)
by SkepticalMario (on 4. April 2025, 02:27)
3035
100 %
unsolvedSandwich Sudoku
by kolot (on 15. July 2021, 18:33)
365
96 %
unsolvedU-Bahn under Tripleblock for polar
by KNT (on 1. January 2024, 08:23)
315
97 %
unsolvedSubway To Hell
by Piatato (on 27. January 2024, 15:45)
335
100 %
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