Epic Marble Race: Nova Bounce Spike vs Zenith Thunder Spear | AI Physics Battle | Echo Circuit Chapter

English AI-generated marble race and physics simulation tournament video.<br />Format: 4 contenders, HP battle system, shrinking arena, and sudden-death pressure.<br />Featured contenders: Nova Bounce Spike, Zenith Homing Orb, Aurora Missile Rain, Zenith Thunder Spear.<br />Grand final matchup: Nova Bounce Spike vs Zenith Thunder Spear. Champion: Nova Bounce Spike.<br />Rules: every fighter starts with 100 HP, collision damage accumulates, and the last survivor wins.<br />Keywords: marble race, physics simulation, ASMR collision sounds, HP tournament, AI battle shorts.<br />AI-generated content disclosure: enabled.