PlateShuntCauseway

Portrait endless shunting. A single energy slab runs up a four-lane causeway while the causeway scrolls down to meet it, rows of tiles arriving one after another. Wherever the slab stands, that lane has to still hold a tile when the row lands, or it drops through. Some tiles blink a few times and then vanish, so the lane cannot simply be read at the last moment - the path has to be picked early. Every lane crossed is paid for out of a charge pool that refills at a fixed rate: a single shunt is always affordable, shunting without pause is not, and once the tiles thin out and the causeway speeds up that pool is what actually ends the run. A Stable Slab absorbs one drop, and a Tile Generator fills the causeway ahead for six seconds. Endless mode with no fixed stage.