Part of Stage 3 — "can I build a world?" A game world is bigger than one screen. These examples move the world past the camera: layers at different speeds for depth, a world streamed a column at a time, and per-scanline HDMA scrolling for the parallax the SNES is famous for.

The ladder

Rung	Example	Developer question
5.1	mixed_scroll	How do I scroll layers at different rates for depth?
5.2	continuous_scroll	How do I scroll a world bigger than one screen, streaming tiles at the seam?
5.3	parallax_scroll	How do I get per-scanline parallax with HDMA?

The idea in one screen

Every background has hardware scroll registers (BGxHOFS/BGxVOFS); you change where the PPU reads, never the tilemap, so scrolling is nearly free. Scroll two layers at different rates and the far one looks distant (mixed_scroll). When the world is larger than the 32×32 tilemap, stream a fresh column of tiles into VRAM each time the camera crosses a tile boundary (continuous_scroll). For a gradient of speeds within one layer, rewrite the scroll register every scanline with HDMA (parallax_scroll).

Next stop in Stage 3: maps/ — let a map engine and a Tiled pipeline drive the world instead of hand-streaming it.

Continuous Scroll Mixed Scroll Parallax Scrolling