Tip: After editing your overworld, make sure to use an EMPTY save file, as save files with progress may load Mario's position based on previous versions of the overworld. Note that altered level flags will also only take effect on new save files.
Player Y position (16-bit) within the level, next frame (calculates player position one frame ahead, as opposed to $7E:00D3). It's also used as a player Y position on-screen on the overworld border.
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