In the nickel mining mini-game, players are tasked with matching and collecting identical stones to extract nickel from the mines. The game features a grid filled with various types of stones, each representing a different material or obstacle in the mining process.

To extract nickel, players must strategically match three or more identical stones in a row, either horizontally or vertically. Each successful match results in the removal of the matched stones from the grid and the collection of nickel resources.

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