StackWorld

- **Hero card** — Your protagonist stays on the table; position matters for gathering.

- **Basic packs** — Spend coins for random draws (1–3 cards per purchase from the basic pool).

- **Physical stacking** — Drag cards to stack them; matching materials can merge into taller piles when space allows.

- **Gathering** — Stand **gatherable** cards above your hero; a channel fills on the **bottom** card of the pile. Completing it grants coins and spawns a material card; gatherables then cool down and recover.

- **Auto-merge** — New materials **fly** toward nearby matching piles when in range; everything uses smooth **fly-in** motion, including manual stacks.

- **Sell zone** — Drop a **stack** (not the hero) on the corner Sell target to cash in for coins.

- **Table limits** — Stacks that would push the bottom of a pile past the field edge are blocked—same rule for hand-stacking and auto-stacking.