First Seen Recall

In First Seen Recall, the challenge of memory lies not in "remembering everything" but in "remembering only the first time". The system will display a series of numbers, in which each number appears exactly twice-but your task is not to repeat everything, but to extract the order in which each number appears for the first time accurately and enter it once in this order. For example, if you see 2 1 2 3 1 3, the correct answer is 2 1 3.
This is a subtle test of attention selectivity, working memory and logic of de-duplication. You need to actively filter duplicates in the information flow, lock in the "first appearance" moment, and build a clear path without redundancy in your mind. A little distracted, it may be disturbed by the second number, disrupting the original order.
First Seen Recall is not only a puzzle game, but also an effective training tool to improve information screening ability and short-term memory efficiency. Suitable for students to exercise their concentration, programmers to strengthen logical tracking, or any player who wants to learn to "grasp the backbone and abandon redundancy" in the era of information overload.