PuyoSim is the name of the Puyo Puyo chain simulator used on Puyo Nexus.
- Standard Puyo types plus others only seen in specific rules or games
- Board sizes ranging from 3x6 to 16x26
- Adjustable simulation settings to match various rules
- Customizable board and Puyo skins
- Shareable chains, along with images and animated images
- Local saving
- Selectable chains and attack powers seen in the official Puyo Puyo games
PuyoSim's sole contributor is Nick Woronekin.