GradientDirPick is a vertical light-strategy tap challenge mobile game focused on timed memory and sequential operation. Players must observe the recipe order shown on the left side during a tense countdown, then tap the correct hierarchical layers from the candidate materials below in sequence, stacking them into the central device to complete a synthesis round. As the score increases, the number of available materials grows and the recipe length extends, testing both reaction speed and short-term memory along with operational stability. The game is easy to pick up with a brisk pace; every successful recipe completion delivers clear feedback and mounting pressure, making it ideal for repeated attempts to achieve higher scores.