999SLNephthys is a vertical casual platformer mobile game that combines rhythm tapping with precise navigation mechanics. Players tap the screen to make a forest lantern moth spirit flap upward; releasing lets it fall naturally under gravity. You must find safe gaps between vine pillars approaching from the right and pass through lantern gate rings to advance. Each successful pass scores points; as your score rises, obstacles move faster and gaps narrow. Hitting a vine pillar, touching the ground, or hitting the top edge ends the round. You can pause, restart, or check the highest score at any time. The controls are very simple, yet you need to predict landing points and control tapping rhythm—easy to learn, yet challenging.