Falling blocks, but no line clears. Build groups of four or more of the
same color — they pop, clear, and score.
Objective: Survive & score by merging color groups. Stack to
the top and it's over.
Controls: Arrows / on-screen buttons move; Up or Space to rotate;
Down to drop. On phone: tap rotates, drag sideways to move.
Scoring: Points per merged cell, multiplied by cascade depth. Long
chains pay big.
Tip: Don't rush to merge at four — line up extra same-color
cells above so the collapse triggers a chain.