How to Consistently Set Up 4-Line Board Clears in Block Flow

The anatomy of a quadruple clear

A quadruple clear is one of the most exhilarating moments in block puzzles: triggering an immediate 4x multiplier bonus, dynamic particle fireworks, and hundreds of bonus points.

To achieve this in <a href="https://apps.aagyasharma.com/blockflow/">Block Flow</a>, you must construct two parallel rows and two intersecting columns that all converge on an open central vertex.

Dropping the catalyst block

When a 2x2 square or T-piece drops into the primed intersection, it completes all four lines simultaneously, triggering an all-clear cascade that empties half the board in a single move.

• Prime two rows and two columns to 7/8 completion.
• Never fill the shared intersection square prematurely.
• Use an Undo booster if an incoming shape threatens your setup.