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In most versions, there are no time constraints during the game.

However, some implementations gradually push the rows upward or drop blocks from above.

Sometimes the player can control the number and timing of blocks that drop from above in certain ways.

For example, on some implementations for the iOS, this can be done by shaking the device.

The game ends if a timer runs out or if no more blocks can be removed.

Some versions, including some versions for Windows Mobile, include both portrait and landscape orientations.