Bubble Bobble: Lost Cave is a fan-made modification of the code from Taito's original Bubble Bobble (1986): it keeps the gameplay of trapping enemies in bubbles and popping them, with Bub and Bob as the protagonists, but replaces the original hundred-floor map with a completely new level design devised by the hack's author.
Like most of these romhacking scene works, it's not affiliated with Taito or the original creators: it's a fan project for fans, meant for those who already know the original game by heart and are looking for a different design challenge on the same engine.

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