Sprawling fork with far more heroes, items and mechanics than vanilla.
Rat King Adventure is a long-running fork of Shattered Pixel Dungeon that expands well past the original's scope — extra hero classes, a much larger item pool, reworked mechanics and new content layered throughout the dungeon. It installs and saves separately, so it never disturbs a vanilla run.
Desktop builds are Java, so PlayBound installs a Java runtime for you if one isn't already present.
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Minimum
1 GHz CPU · 1 GB RAM · Any GPU · 200 MB storage
Recommended
Any modern machine
Vouched for by established community members, not yet PlayBound tested.
The original roguelike by Evan Debenham, as released upstream.
Deliberately generous fork — stronger heroes, a more forgiving run.
Looking for the base game?
Shattered Pixel Dungeon has an overview, reviews and discussion covering every edition.