1) Unlike Asteroids, in which it is possible to avoid using thrust, Quark requires that you become extremely proficient in accurate thrust and stop movements. Until you have mastered this, upper levels will be unattainable.
2) Make sure that your control keys are comfortably placed. In particular, make sure your shield key is easily reached. Shields are very important in Quark. Don't hesitate to use them frequently. Shields can be replenished often, assuming you can pick up the Weapons Help.
3) Every stage demands a different strategy. In some stages, for example, the "kill everything as quickly as possible" approach is not helpful, and could actually be the wrong way to complete the stage.
4) Crystals, crystals, crystals. Crystals appear frequently, although sometimes not frequently enough. Every stage demands a different number of crystals. If you collect more crystals than are needed, they will count towards the next stage. This in itself is a useful tip.
5) Quark rounds are timed. When the round time is approaching 0, your bonus will flash red. The only recourse in this situation is to immediately kill remaining enemies. Otherwise, very bad things will happen.
6) Free ships are granted every 50000 pts but ONLY FOR REGISTERED USERS.
7) Read the help screens carefully, they may provide you with valuable clues which allow you to use your ship and game features to their full extent.
