Something I did when I create the Game of Life was a drag and click thing. I noticed that you didn't add this feature to the Game of Life on your website. Github, for some odd reason, doesn't support .js files so here is the code.

`let drag = false, moved = false;

canvas.onmouseup = (event) => {
drag = moved;
let x = (event.clientX-rect.left)(canvas.width/rect.width);
let y = (event.clientY-rect.top)(canvas.height/rect.height);
let col = Math.floor(x/cell_width);
let row = Math.floor(y/cell_width);
if (!drag) {
grid[row][col][0] ^= 1;
} else {
grid[row][col][0] = 1;
drag = false;
}
moved = false;
save_grid();
clear();
grid_to_canvas();
}

canvas.onmousedown = () => {
generations = 0;
print_generations();
stop();
drag = true;
}

canvas.onmousemove = (e) => {
if (drag) {
moved = true;
let x = (e.clientX - rect.left) * (canvas.width / rect.width);
let y = (e.clientY - rect.top) * (canvas.height / rect.height);
x = Math.floor(x / cell_width);
y = Math.floor(y / cell_width);
grid[y][x][0] = 1;
save_grid();
clear();
grid_to_canvas();
}
}`