When you apply gravity to a sprite, you increase its downward velocity each frame, making it fall as if pulled by gravity. This is done by adding a gravity value to the sprite's vertical velocity and then updating its position. Collision detection ensures that the sprite does not fall through the ground or other objects. In this example, once the sprite's y position reaches the ground level, its position is set to the ground and its vertical velocity is reset, preventing it from sinking below the surface.

You can expand this basic logic for more complex games by adding horizontal movement, multiple platforms, or different types of collisions. For instance, you might check collisions against several objects; handle bouncing by reversing velocity; or trigger events when two sprites overlap. As your games become more advanced, you can build on this foundation for more realistic and interactive gameplay.