diff --git a/app/src/main/java/sudoku/SudokuSolver.java b/app/src/main/java/sudoku/SudokuSolver.java
new file mode 100644
index 0000000..8f33998
--- /dev/null
+++ b/app/src/main/java/sudoku/SudokuSolver.java
@@ -0,0 +1,31 @@
+package sudoku;
+
+public interface SudokuSolver{
+    
+    // Work in progress
+
+    /**
+     * Set sudoku board, numbers 1-9 are fixed values, 0 is unsolved. 
+     */
+    void setBoard(int[][] board);
+    
+    /**
+     * Get the sudoku board
+     */
+    int[][] getBoard();
+
+    /**
+     * Solve soduko
+     * @return true if solution could be found
+     */
+    boolean solve();
+
+    /**
+     * Check if digit is legal on the current board
+     * @param row
+     * @param col
+     * @param nbr
+     * @return true if legal
+     */
+    boolean legal(int row, int col, int nbr);
+}
\ No newline at end of file