Block Stacker

Block Stacker is a falling-block puzzle game inspired by one of the most iconic video games ever made. Geometric pieces made of four blocks (tetrominoes) fall from the top of a 10-wide, 20-tall playing field. Your job is to rotate and position them to create complete horizontal lines, which clear from the board and earn points. As you clear more lines, the pieces fall faster, testing your speed and spatial reasoning.

1. Click 'Play' to start. Blocks begin falling from the top.
2. Use Left/Right arrow keys (or A/D) to move the piece sideways.
3. Press Up arrow (or W) to rotate the piece.
4. Press Down arrow (or S) to speed up the fall.
5. Press Space to instantly drop the piece to the bottom (hard drop).
6. Complete a full horizontal row to clear it and score points.
7. The game ends when blocks stack to the top of the field.

• Seven different tetromino shapes fall in random order: I, O, T, J, L, S, Z.
• Pieces can be moved left, right, and rotated while falling.
• A piece locks in place when it lands on the bottom or another piece.
• Complete horizontal lines are cleared from the board.
• Clearing multiple lines at once scores bonus points (1=100, 2=300, 3=500, 4=800).
• The game speeds up as you clear more lines.

• Keep the board as flat as possible — avoid creating holes or tall towers.
• Save a column for I-pieces (straight 4-block) to clear four lines at once for maximum points.
• Think ahead about where the next piece will go while placing the current one.
• Avoid building up one side — keep the board balanced.
• Speed increases are gradual, so focus on clean placement over rushing.
• Use the ghost piece (transparent preview) to see where your piece will land.

• Marathon: Classic endless mode — play until you top out.
• Sprint: Clear 40 lines as fast as possible.
• Ultra: Score as many points as possible in 2 minutes.

• Block Stacker is pure gaming perfection. The rules take 30 seconds to learn.
• The satisfaction of clearing lines — especially a perfect four-line clear — is unmatched.
• It's meditative at low speeds and exhilarating at high speeds, making it endlessly replayable.

Play Block Stacker free in your browser. No downloads, no sign-ups — just falling blocks and pure puzzle action. Track your score and lines cleared. Mobile-friendly with on-screen controls.

Block Stacker is the ultimate test of spatial thinking and quick reflexes. Stack blocks, clear lines, chase high scores, and experience why this format has captivated players for decades.