Rondoku (2025)

Developer: Lucas Demo
Platforms: Windows, Linux
Genres: Casual, Indie, Strategy
Rating: 5.0 of 5, 25 player ratings
Typical playtime: about 3.9 hours
Where to get it: Steam

The 3D catalog: game boxes on wooden shelves, with the cat sitting at the counter next to its greeting.

The catalog in 3D

The same catalog has a room you can walk around in. The cat behind the counter is the AI Catbot, and they pick real games from it when you tell them what you feel like playing. Nothing is for sale, here or in there. Go in from here and this game is already out on the counter, with more like it waiting on the shelf next to it.

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How it feels

a meditative puzzle game where you fill circular grids with numbers, rewarding careful thinking with quiet satisfaction

calmminimalistlogicalcontemplativesatisfyingslow-paced

What players say

Players praise Rondoku as a clever minimalist twist on Sudoku that replaces columns with interlocking rings. The puzzles start gentle but steadily increase in difficulty, with one notable spike in the final puzzle that some found frustrating. The lack of music and note-taking tools is a deliberate design choice that players either appreciate as zen-like or miss for complex logic.

Screenshots

More games like this

This page is from Underplayed Gems, a catalog of older and overlooked games. Not quite it? You can browse by platform and genre, or take this one into the 3D catalog and ask the Catbot for something closer.