From Level 58 solution (https://gamefaqs.gamespot.com/gameboy/579654-puzznic/faqs/65879):
"The cursor will follow as long as you hold A or B, down, understand? Bring the topmost "8" left once and, as it falls, let go of A/B as it passes the other "8" and bring that one to the right as well, which will delete those three blocks."
If I assume that "A or B" corresponds to "shift" in the Javascript version I am not able to unfollow the falling icon. Cursor will constantly stay on the falling icon even when I am not pressing "shift" anymore.
From Level 58 solution (https://gamefaqs.gamespot.com/gameboy/579654-puzznic/faqs/65879):
"The cursor will follow as long as you hold A or B, down, understand? Bring the topmost "8" left once and, as it falls, let go of A/B as it passes the other "8" and bring that one to the right as well, which will delete those three blocks."
If I assume that "A or B" corresponds to "shift" in the Javascript version I am not able to unfollow the falling icon. Cursor will constantly stay on the falling icon even when I am not pressing "shift" anymore.