All puzzles have been solved. And only tank game doesn't light the green light for me next to door. I have shot down the UFO 20 times. Whats the secret?
You can make your game much longer if you place AA cannons almost outside the map. You choose AA cannon and you point your mouse on the very edge of the map (downside) and you click. In that way you place your AA cannon off the map, and no artillery will threaten your cannons. And you will shoot down all their aroplanes. Soon the cannons become officers and 5 cannons will hold back all the front.
Level 42 - Life the universe and everything.
The Answer to Life, the Universe, and Everything is numeric in Douglas Adams' infamous trilogy The Hitchhiker's Guide to the Galaxy. In the story, a "simple answer" to The Ultimate Question is requested from the computer Deep Thought, specially built for this purpose. It takes Deep Thought 7½ million years to compute and check the answer, which turns out to be 42. Unfortunately, The Ultimate Question itself is unknown.
Good book, and good movie. Read more books!