UFO invasion
Electronic
7400, 7476

Do you believe in UFOs?

Even if you don't, you'll enjoy this game as you try to defend Earth against a UFO invasion!

This is a complicated project, so take your time in making the wiring connections.

Turn the Control Knob clockwise to switch power ON.

The LED Digital Display will show the letters "U", "F" and "O" in a repeating sequence. At the same time you'll hear a sound from the Speaker indicating that the UFO is flying overhead.

It's up to you to save Earth from the invasion! To stop the UFO, you'll need to use your laser cannon. We've cleverly disguised this as the Key. Look carefully at LED 1.

When this lights up, it means that the UFO is now within the range of your laser cannon.

Press the Key to fire.

If you hit the UFO, the Digital Display will stop on one letter and you'll hear a steady sound from the Speaker. If this happens, congratulations!

You saved Earth from the UFO! (Of course, you might miss the UFO. If this hap- pens, wait for LED 1 to light again and fire your laser cannon once more.)

The UFO display and sound will start again a few moments after you make a hit. If you want to speed up or slow down the UFO, adjust the Control Knob for the desired speed.

As you play this game, you'll notice that hitting the UFO isn't a matter of luck. You'll find that when a certain letter appears on the Display is the best time to press the Key.

Why do you think this is so?