Double Ships
Wait until one of the top shipsthe green ones that take two shots to kill comes down and fires off a tractor beamthe beam that can capture your ship Let it capture your ship Now wait until it swoops down again with your ship behind it Simply kill the head shipthe green one and it will lose your ship Your ship will then lock on to the side of your current ship giving you two ships to play with at the same time Now be careful Not only will both ships be firing at you after your ship gets captured but if you accidently shoot your captured ship youll destroy it Also note this will cost you one life but will definately make the Challenging Stages and perhaps the game itself a little easier to play
Stop Enemies from Firing
On most revisions of Galaga theres a trick that stops enemies from firing at your ship In Stage 1 kill all aliens except the two bees in the bottomleft corner Allow the bees to dive down and shoot at you while dodging their shots After around 15 minutes or so the bees will continue to drop down but they wont fire Let them drop down another 5 or 6 times then kill them After all this enemies will not shoot at you for the rest of the game