The number of special achievements in "Narita Boy" is very large, and the Big Brother House achievement is one of them. The requirement of this achievement is to find the secret room of Taiyo Beam, which is in the yellow/desert area. In "Oasis", we do not need to enter the meditation code to go to the other side of the oasis.
How to achieve success in Narita Boy Big Brother's House
Big Brother's House
Find Taiyo Beam's Secret Room
Location: Yellow/Desert Area
In Oasis, instead of using meditation code to go to the other side of Oasis, use this code: □, ∴, >, you can find yellow and blue symbols on the other side of the oasis, and when you get the invisible code achievement, you can find red symbols.