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Blocker Removal is a feature where parts of the reels are obstructed by inactive 'blocker' symbols at the start of the game, and these blockers are removed through specific in-game actions to progressively expand the game board. The core of this feature is to provide the player with a clear mission of 'unlocking closed spaces to win bigger rewards', and to give the visual fun and sense of achievement of watching the game board grow.

An Instant Prize Symbol is a special symbol whose role is to pay a set cash value or bet multiplier just by appearing on the reels. The core concept is that it provides a direct reward by its mere presence, without the need to form a winning line like regular symbols. It is often called a 'Coin' or 'Money Symbol' and serves as the most basic 'material' in various bonus features of modern slots.