Kurodoko — Free Daily Online Logic Puzzle

How to play

Shade black cells so each number equals the white cells visible from it (itself included). Black cells never touch; whites stay connected.

Origin & history

Kurodoko ('where are the black cells?') is a Nikoli logic puzzle, also known abroad as Kuromasu.

FAQ

When does the daily puzzle change?

It rolls over at midnight (device time) to a new 6×6 board, and everyone gets the same board on the same day. Any arrangement that satisfies all the rules counts as solved.

How does the streak work?

Solving the daily puzzle on consecutive days grows your streak by one; skipping a day resets it to one. Records are stored only in this device's browser.