Thirty-two blocks. Three balls.
Hand-rolled collision code — no physics engine, no libraries. Every bounce resolves through an axis-aligned bounding box, gets pushed out along its minimum translation vector, and re-normalises against a fixed speed so the ball never drifts out of spec.
Hit position decides the exit angle: θ = rel × 60°, with a nudge from paddle velocity.
Centre contact sends it straight up, edge contact rakes it sideways at up to ±60°. A still paddle
nudges dead-centre hits off-axis so the ball can't lock into a vertical loop.
Every substep collects all overlapping blocks, keeps the deepest one, and resolves only that. Overkill on one frame costs one block, awards 10 points, and never double-flips the velocity — the classic stuck-in-a-row bug that traps the ball inside the wall.
Movement splits into substeps of ≤2px against a 20px-tall block, and a fixed 16.67 ms accumulator keeps the feel identical at 60, 90 or 120 Hz. Long frames run at most five catch-up ticks, then drop time.
Paddle clamped to 0–340. Park it against a wall and the paddle seals the gap: a ball falling beside it
is pushed back into play instead of slipping through. Side faces of the paddle reflect
dx, the top face reflects dy — chosen by the shallower penetration axis.