About Block Stacker

Block Stacker is a classic Tetris-style falling block puzzle game. Tetrominoes (four-block shapes) fall from the top of the board. Your goal is to arrange them to fill complete horizontal lines, which are then cleared to score points.

Scoring

1 line: 100 points × level
2 lines: 300 points × level
3 lines: 500 points × level
4 lines (Tetris): 800 points × level

Controls

Key / Gesture	Action
Left / Right arrow	Move piece left or right
Down arrow	Soft drop (faster fall)
Space	Hard drop (instant drop to bottom)
Up arrow or Z	Rotate piece clockwise
X	Rotate piece counter-clockwise
C	Hold current piece (swap with held piece)
P	Pause / resume

Tetromino guide

Piece	Shape	Common name	Best use
I	4 cells in a row	I-piece / Line	Filling narrow columns; clearing 4 lines (Tetris) in one move
O	2×2 square	O-piece / Square	Filling rectangular gaps; stable in any orientation
T	T-shape	T-piece	T-spins; versatile filler
S	S-shape	S-piece	Filling right-leaning gaps
Z	Z-shape	Z-piece	Filling left-leaning gaps
J	J-shape	J-piece	Filling left-side overhangs
L	L-shape	L-piece	Filling right-side overhangs

Strategy tips

Keep the stack flat: a flat, even top surface gives every piece a legal placement. Avoid tall spikes and isolated holes.
Save the I-piece for Tetris: build a flat stack with one column left open, then drop the I-piece to clear all 4 lines at once for maximum score.
T-spin bonus: rotating a T-piece into a T-shaped slot (a T-spin) scores a bonus multiplier in most Tetris rule sets, even clearing fewer lines.
Use hold strategically: hold the I-piece until you need it for a Tetris; hold an awkward piece until the board is ready for it.