Favorite trick in the game (spoilers possible)

[Thorpe]

I'm not really sure if this counts as a trick or not, due to both its relatively high requirements, and the fact that it gives no points, but if you have both the Mirror Thingamajic, Gravity Shunt, and Hyperdrive (end game, in otherwords), eleminating pesky alien war fleets becomes no problem. Hyperdrive to a handy nearby Black Hole, and simply use the mirror. Unfortunately for the aliens, they have their adventure ended prematurely.