1. Falling Block: A new dropping block appears at the top every round.
2. Placement Control: Drag the falling block horizontally, release your finger and the block falls vertically downwards.
3. Merge Rule: Two blocks of equal value merge into one block with doubled value, and you will receive corresponding points.
4. Chain Merge: If the newly‑merged block touches another identical‑number block, a chain merge will be triggered automatically.
5. Game Over Condition: When there is no empty space left on the board and new blocks cannot drop down, the match ends.
6. Score Tracking: Your real‑time Score is shown on‑screen. Your highest historical score (Best) will be saved automatically.
Number Nightmare is a falling‑block number‑merging puzzle game.