Sudoku

Suduko is a popular Japanese number logic puzzle game.

Sudoku gameplay

In sudoku the goal is to fill a 9 x 9 grid with numbers so that every column and row in the main grid and each 3x3 sub grid contain all the numbers 1 to 9. You are provided with a few start numbers which makes the puzzle only have one solution.

Thirdle and Sudoku

Thirdle share the logic puzzle part from Sudoku where you need to move around your tiles in a grid, in sudoku the numbers are unique, but in Thirdle the grid can contain duplicates. That you start with a few letters is similar to Sudoku.