either press 1/0 key or press on the cards. Press shift + flag when starting. Q: Why is the number flashing? A: Read the instruction carefully. Q: How does the key 1/0 work? A: it adds 1/0 to the end of you binary string and push outs (deletes) the first number of the string.
credits to amacha-no-ongaku-kóbó （甘茶の音楽工房） for this lovely bgm.
