What difficulties does Science Lab include?

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

Do I need an account for Science Lab?

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

Thinker

XV Sudoku

Neighboring cells marked V sum to 5 and cells marked X sum to 10.

Puzzle setup

Select a difficulty to prepare your Science Lab adventure.

How this world works

Test number sums with X and V clues. Neighboring cells marked V sum to 5 and cells marked X sum to 10.