Falling sands

if(sandbox[x][y] > 1) //If the particle is not wall or air
            {
                int type = sandbox[x][y];
                if(particle[type] == 1) //If the particle has regular gravity
                {
                    if(sandbox_status[x][y] == 0) //If it hasn't been updated yet
                    {
                        if(y > MAP_WIDTH-17)
                        {
                            sandbox[x][y] = 0;
                        }
                        else
                        if (sandbox[x][y+1] == 0) //If there is a free spot below it move it down
                        {
                            sandbox[x][y+1] = sandbox[x][y];
                            sandbox[x][y] = 0;
                            sandbox_status[x][y+1] = 1;
                        }
                        else
                        //Move down and left or right
                        if (sandbox[x][y+1] != 0 && sandbox_status[x][y] == 0) //If there is a particle below it
                        {
                            if (sandbox[x+1][y+1] == 0 && sandbox[x-1][y+1] != 0) //If a particle is down to the left and not down to the right
                            {
                                sandbox[x+1][y+1] = sandbox[x][y];
                                sandbox[x][y] = 0;

                                sandbox_status[x+1][y+1] = 1;
                            }
                            else
                            if (sandbox[x-1][y+1] == 0 && sandbox[x+1][y+1] != 0 && sandbox_status[x+1][y+1] == 0) //If a particle is Down to the right go to the left.
                           {
                                sandbox[x-1][y+1] = sandbox[x][y];
                                sandbox[x][y] = 0;

                                sandbox_status[x-1][y+1] = 1;
                            }
                            else
                            if (sandbox[x-1][y+1] == 0 && sandbox[x+1][y+1] == 0)
                            {
                                if(y%2 == 0)
                                {
                                    sandbox[x+1][y+1] = sandbox[x][y];
                                    sandbox[x][y] = 0;

                                    sandbox_status[x+1][y+1] = 1;
                                }
                                else
                                {
                                    sandbox[x-1][y+1] = sandbox[x][y];
                                    sandbox[x][y] = 0;

                                    sandbox_status[x-1][y+1] = 1;
                                }
                            }
                            else
                            if (sandbox[x+1][y+1] > 0 && sandbox[x+1][y] == 0)
                            {
                                sandbox[x+1][y] = sandbox[x][y];
                                sandbox[x][y] = 0;

                                sandbox_status[x+1][y] = 1;
                            }
                            else
                            if (sandbox[x-1][y+1] > 0 && sandbox[x-1][y] == 0 && sandbox_status[x-1][y]==0)
                            {
                                sandbox[x-1][y] = sandbox[x][y];
                                sandbox[x][y] = 0;

                                sandbox_status[x-1][y] = 1;
                            }
                        }
                    }
                }