Disagree. The Game Boy will take sections of RAM and render them to backgrounds and/or sprites. That's it. Any connection between those hardware elements and

Disagree. The Game Boy will take sections of RAM and render them to backgrounds and/or sprites. That's it. Any connection between those hardware elements and objects in a game's state, as well as updates to that state, must be maintained and implemented by software, and that software is the game engine. For example, on the NES, the hardware can display 64 8x8x2bpp sprites, on a roughly 64x64 tile background where 1/4 of it is visible at any given time. Mario Bros' uses the hardware to "draw" Mario as 8 sprites by adjusting registers per frame, but things like what happens when movement commands are received, when Mario hits bricks and other objects, does not involve the PPU at all.