One continuous cause-and-effect run: trapdoor → zigzag ramps → dominoes → seesaw catapult → aerial catch → pulley gate → plinko board → finale button. Nothing advances on a timer — every stage is triggered by contact / position / momentum of the previous stage inside the physics loop. Drag the speed down to 0.1× or use Step while paused to inspect the handoffs frame by frame.
Each handoff is a checkTriggers() test on live bodies:
ball→ramp contact, ball→domino impulse, domino-top→next-domino angle,
domino→seesaw overlap, seesaw ω→ball release, ball→bucket containment,
bucket y→gate opening, ball→peg bounce, ball→button pressure.
No setTimeout / setInterval drives the chain — timers only render frames.