
This trick is perhaps most effective in the much harder Second Quest, where you obtain the Flute in Level 2. The number of Heart Containers will still max out at 16, and you can't get any more than that. As such, the heart piece can be obtained only once per Flute destination for a total of 8 "duplicated" hearts, plus one more for obtaining the Heart Container normally.

This variable is checked to determine which collect flag to set when obtaining the main room item. The glitch occurs because the current room index ( $00EB) is changed once you get caught by the whirlwind, setting it to the room to the left of the dungeon entrance that you spawn at. However, if you use the Flute while standing in the same row as it you'll pick up the Heart Container when the whirlwind drags you across the screen, and the Heart Container will still be there when you return.

In the original FDS release (Rev 0), there is a glitch that allows players to easily get a lot of extra Heart Containers: on the eastern shoreline, there's a Heart Container that is normally only reachable with the Ladder.
