Block Force

Another puzzle game from RCM, who were perhaps hoping to replicate Magic Jewelry‍ '​s success with a clone of Konami's Quarth - they even doubled the size of their development team (to two people).

...Unfortunately for them, Konami brought Quarth to the Famicom officially that same year, rendering their efforts slightly redundant.

There are two versions of the game, one with copy protection, the other without. On the unprotected version's ROM, there is a what appears to be an digitized portrait of an unknown person (likely one of the developers), complete with an associated tilemap for it.