Transport Tycoon

To kill off the computers aircraft, build a big hill at
the end of his runway and cover with lots of trees.

Make a railroad tunnel and go to an extreme and then
make a tunnel with a value negative that you donīt have and
that negative value will become positive

When you rename a town rename it "Happy Town" it will give
your town a good rating.

To kill buses of the computer, build a snakelike railroad
over his road, put a train on it and see how his busses are
shortly waiting and then be destroyed.
Be warned: Use it only on roads, which YOU don't need, else
you could loose your own buses, trucks...

Go to the edge of the map and from the shore build a tunnel 
towards the other side of the map, and you will receive the 
amount of money it costs to build the tunnel you can get 
over $2,000,000,000.