Tip: Take advantage of easy to install Patches in your hack. The No More Sprite Tile Limits or SA-1 patches should be considered if you're encountering glitches where Mario and/or sprites are turning invisible.
Used most often in tracking the second sprite being checked in various interaction routines, for example the second sprite's index in the sprite contact routine. It also serves a use during checking when a sprite is entering/exiting water.
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