What difficulties does Logic Observatory include?

Choose Very Easy, Easy, Medium, Hard, or Hardest. Each level uses its own clue and difficulty profile.

Do I need an account for Logic Observatory?

No. The game works without an account and saves the current puzzle locally on this device.

Expert

Arrow Sudoku

Digits along an arrow add up to the value in its circle.

Puzzle setup

Select a difficulty to prepare your Logic Observatory adventure.

How this world works

Trace arrow sums through the stars. Digits along an arrow add up to the value in its circle.