5-275 for size. For big mazes turn on turbo mode. Shift + green flag. Once it's done press space and it will solve the maze. Press the restart button on the bottom left to restart. It doesn't let you choose another size, so if you want another one just press the green flag. Press 0 to show the stats and press 1 to hide them (You have to release.)
https://scratch.mit.edu/projects/510068047 for original project.