English AI-generated marble race and physics simulation tournament video.
Format: 4 contenders, HP battle system, shrinking arena, and sudden-death pressure.
Featured contenders: Echo Prism Nova, Nebula Thunder Spear, Aurora Mirror Clone, Echo Storm Beacon.
Grand final matchup: Nebula Thunder Spear vs Aurora Mirror Clone. Champion: Aurora Mirror Clone.
Rules: every fighter starts with 100 HP, collision damage accumulates, and the last survivor wins.
Keywords: marble race, physics simulation, ASMR collision sounds, HP tournament, AI battle shorts.
AI-generated content disclosure: enabled.
