BC8Aethe is a vertical number deduction puzzle mobile game that combines memory observation with pattern reasoning. Players must focus on a sequence of numbers lighting up one by one in a tower, remembering the numbers that have appeared during the brief reveal, quickly identifying the arithmetic progression between them, and then tapping the correct next number from several distracting options. Correct answers accumulate points and speed up the reveal rhythm, while wrong answers count as a mistake; three mistakes end the round. The pace gradually accelerates from slow to fast, with the option to pause, restart, or check the highest score at any time. The rules are simple but tighten step by step, making it easy to learn yet challenging enough to test focus, mental arithmetic speed, and on-the-spot judgment.