She was forced to slow her pace again as the difficulty of the terrain increased.

The couple's difficulties increased when their only son was born deformed and died soon after birth.

The variety, and the difficulty of choosing, may only increase in the short term.

Higher difficulties increase the number, speed, and health of monsters.

The difficulty and speed of the game increases as the player progresses through the levels.

There was no control group for which task difficulty did not increase to match participants' developing working memory.

Players can not return to previous levels, and the difficulty of foes increases with each level.

The difficulty of the games progressively increase throughout the show.

The difficulty and quantity of enemies increase along with the level number.

But to union officials, the economic difficulties increase the likelihood that companies will make use of their power to lay workers off.