In Drelbs, a set of randomly-arranged lines are already in place on the screen, and moving your character into contact with them pushes them in the direction of contact. Forming a complete square locks it into place, and it turns into a barrier. After a certain period of time, a monster may appear in a barrier which results in death if you make contact with it. After a little while the monster disappears taking the barrier with it.
After producing enough squares/barriers, one will randomly change into a stairway, which can lead you into a bonus room. Making things harder are the enemies which chase your character around the screen, again contact with these results in death.
This game is a free remake of the Commodore 64 game of the same name.
[source:mobygames]
Distribution : Retail - CommercialPlatform(s) : Amiga
Links