Rotating Gap
The wall is a circle with a rotating angular gap.
Browser physics toy
BouncyBalls
A small browser-based physics toy. Balls bounce inside a rotating circular wall until they find the moving gap and escape.
0/20 live balls
Vector Reflection
Collisions bounce by reflecting velocity around the wall normal.
Escape Test
Escape compares the ball boundary angle with the current gap angle.
Canvas Port
The Python/Pygame prototype was ported to web-native Canvas.