Achieving high scores in Block Blast hinges on three essential tactical habits. First, prioritize grid space management by keeping the board center clear and eliminating isolated pockets, ensuring bulky shapes never end your run unexpectedly. Second, analyze all three spawned blocks before placing your first tile; mapping out the entire placement sequence guarantees efficient spatial flow and prevents awkward gaps. Finally, focus on sustaining combo streaks by clearing lines on consecutive turns. Maintaining consistent combo chains drastically multiplies your score, creating the momentum needed to easily shatter your previous records.