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This mod mainly uses CheapHack for an engine. Telejano might work too.
Galactix is an arcade-type overhead space shooter. Think of Raiden. You fly around picking up powerups and destroying enemies for points, in hopes of making the high score.
There are various sizes of enemy ships, all of which can have one of several different attack patterns. There are also several different types of asteroids to worry about.
Powerups include bonus points, weapon ups, missile ups, health, and mega bonuses. A mega bonus will cause asteroids and most enemies to stop appearing for a short time and will fill the screen with powerups. Weapon ups will each increase the level of your weapon. Missile ups give you missiles, then increase the power or number of missiles you fire.
When you die, you lose 1 power level for your weapons. However, if you're above the max level, it will drop back down to the max level, losing all extra weapon power, but you get to keep the weapons you have.
You also have 2 special attacks loaded in your ship per life. A special attack will completely wipe out everything on the screen except you and items, and you will get points for everything it killed. Use these when you're in a pinch and need help.
You have 3 lives. Upon your third death, it's game over and your score is set as the High Score if it is high enough. If you reach the end of the level without losing all your lives, you receive bonus points for each life.
The most useful Quake engine to be used is CheapHack. DarkPlaces crashes in a blazing show of reset buttons, and normal quake complains of packet overflows sometimes, and may even crash when it runs out of edicts. CheapHack, on the other hand, is both pretty and stable.
Unfortunately, the version of Galactix up for download was broken for weeks, maybe longer. It didn't work at all. The new version is fixed up and can be downloaded now.
Luckily, the file wasn't screwed up during qexpo, just after; so, hopefully not too many people had trouble with it.