Scratch

A dot is moving to the right on the screen and hits a red rectangle. Here's the problem I keep finding: as long as the dot is "touching" the rectangle the Score keeps rolling upwards!! If the dot hits the rectangle I'd like the score to change only by +1 or -1, depending on the game. And I want the dot to keep on going, because there are other rectangles to meet. But as the dot emerges from the rectangle the score might have gone from 0 to 118!!!! Reducing the size of the Sprites hasn't solved the problem; the score still rolls up because the Sprites are touching for more than an instant. Solutions would be MUCH appreciated!!!