gistfile1.txt

// Make a structure to hold all the grid squares
For each grid square
    Make a grid square container

// Put all the objects in the right grid square container
For each object in the world
    Get the object's x and y coordinates
        Determine which grid square the coordinate falls into
        Add the object to that grid square container

// Get all the objects that a certain object is colliding with
Get the object's grid square
    Return all the other objects in that grid square