3. The screen always scrolls. The player controls a character who is either static or moves freely around the screen.
=== Parallax/Multi Layer Scroll===
Parallax or Multi Layer Scroll is an effect where there are 2 layers of tiles which scroll, one has priority over the other and often they move at different scroll rates.
The following games have parallax or multi layer scroll.
* Wizard Willy
* Teenage Mutant Hero Turtles
==== Software Scrolling ====