Each tutorial includes examples of these collisions used in classic 2D games (redrawn in the #pico8 palette) and has tips about how to make the collisions feel great to the player.

Each tutorial also breaks down an example function in both an expanded version to see all the steps and a condensed version to use in your games.

The math is made simple with step by step explanations and visual aids.

Example: Circle to Circle Collision

Each tutorial has an interactive demo with a button that lets you view the underlying variables used in the math of the collision detection for that type.

Here is Boundary Collision, locking a game object to the designated area.