And now, a (very old) hidden message. While examining a Spanish MSX game from 1990 called "Power Magic" I found something interesting.
The loading screen looks "normal" (typical pixel-art originally made on a ZX Spectrum and ported to the MSX).
However, if you remove the colour attribute and show the pixels only, there is a hidden message dedicated to publisher Dinamic.
For non-Spanish speakers, the translated text reads: "BASTARD DINAMIC. THEY DO NOT PAY THEIR FREELANCERS".
A bit late..

