Puzlogic from developer Eduardo Barreto was released on Steam back in July and it just recently gained Linux support. It combines elements from Sudoku and Kakuro along with some lovely ambient music to create a pretty decent and relaxing experience.
Currently in Early Access, the developer expects the full release to be available in the first part of 2019.
The developer sent over a key and I can confirm it works really nicely on Ubuntu.
- Unique puzzle game with familiar rules
- 52 handcrafted puzzles
- Notation on free spaces
- Simple drag and drop gameplay
- Ambient sounds and peaceful music
- Steam achievements