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: Echo Devour Core, Lunar Blade Cyclone, Echo Blade Cyclone, Cosmo Thunder Spear.<br />Grand final matchup: Echo Devour Core vs Cosmo Thunder Spear. Champion: Echo Devour Core.<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.
