Liquids, snow, and corrosion

How liquids fill cells

Liquids fill finer layers within board cells. A colored cell may contain only some liquid; it is not necessarily full. Liquid in an otherwise empty cell must meet the full-cell condition to count toward clearing a row.

Water, Lava, and other liquid pieces become fluid after placement. Placing solid blocks in liquid can displace it. Passable materials can share cells with liquid.

Contact reactions

Contact	Main result	Edition
Water and Lava	Stone forms at the contact	Full / Lite
Water and Snow	Snow at the contact becomes Water	Full / Lite
Snow and Lava	Produces Steam in Full; Snow disappears in Lite	Full / Lite
Oil and Lava	Steam is produced at the contact	Full advanced reactions
Acid and other participating liquids	Neutralization into Steam	Full advanced reactions

Reactions depend on where liquids touch, not merely whether both exist somewhere on the board. Water and Lava produce Stone; do not assume recipes from other games apply here.

Layering, steam, and freezing

In Full, materials such as Oil, Snow, Water, and Lava can separate and exchange positions according to density. Steam moves upward. Cold Snap and snow weather can freeze Water and drop Snow.

Water, Lava, Snow, Cold Snap, and snow weather are available in both Full and Lite. Complete advanced Oil, Acid, and Steam behavior is only available in Full.

Acid corrosion

In Full, susceptible blocks accumulate corrosion while touching Acid, up to 3. Corrosion can decrease after contact ends. Each point reduces the block’s line-clear damage by 1.

Severe corrosion reduces Obsidian’s remaining clear durability to at most 1 and puts Chess Pieces into their already-triggered state. Losing corrosion afterward does not undo those changes. Cursed Blocks, Gold Blocks, Pollution, liquid materials, and passable materials are immune.

Liquid reactions can cause natural clears when they change the board. The reaction animation itself does not imply additional direct damage.