Grid-Based Backtracking Visualizer

Animate queen placements, highlight invalid moves/conflicts in red, and demonstrate the physical backtracking steps as the recursion winds down.

Backtracking Visualizer

An interactive playground for exploring N-Queens layout searches and Sudoku constraints solvers.

Chessboard Size (N):4x4

Speed300ms

Step 0Total -1

States Evaluated

Backtracks

Solutions Found

Backtracking Execution Trace

1: function solveNQueens(row) {
2:   if (row === N) return true; // Solution found
3:   for (let col = 0; col < N; col++) {
4:     if (isSafe(row, col)) {
5:       placeQueen(row, col);
6:       if (solveNQueens(row + 1)) return true;
7:       removeQueen(row, col); // Backtrack
8:     }
9:   }
10:  return false;
11: }

status:

Queen Placed / Safe Cell

Evaluating / Check

Constraint Violation / Conflict

Backtracking / Undo cell