It's about Sea Sardine Side 2 by MSX Magazine. After beating it (the game has only two levels, by the way) you'll get a password.
Browsing through some of my old (over 20 years old) disks just now, I stumbled upon a textfile containing a password that the game gave me.
This particular password I got after not only beating it, but also cheating it, on a real MSX, which boils down to putting something heavy on the spacebar at the right moment and going for a walk, of which the explanation would be too long to go into right now (not the walk but the auto-farming itself).
The password is
M242 08H6 80DG G006
and in case the player's prowess is recorded therein, it should give you both maxed out "sardine level" and "option level" as well as 51 lives.
Only, I never found a way to get "Side 2" to let you enter a password, nor do I know if other 'chapters' exist. Or that maybe it's meant to be used in some other MSX Magazine production. So, maybe someone here knows what it's for.
