The number of special achievements in "Narita Boy" is very large, and the invisible code achievements are one of them. The requirement of this achievement is to find the entrance to the red symbol of Taiyo Beam, which is the yellow/desert area.
How to do the invisible code achievement of Narita boy
Invisible Code
Find the entrance to the red symbol of Taiyo Beam
Location: Yellow/Desert Area
On the lower wing, after you learn to go upstairs, do an upper tick from the box and rush or charge to the left. You will reach a room with a red sign.
