More than practice, getting high scores in Crisis Courier relies largely on previous knowledge of levels. For example level seven is a maze, and one wrong step will lead you into a dead end. No skill involved there. So play a lot, know the levels and you’ll get that high score. Having a good mouse with a good level of sensitivity is a must for precision and a steady hand helps as well.
Here are some guidelines to follow:
At the start of level one type in ‘kingaltador’ to get that extra life. If you forget, type it at the beginning or end of any level, when you have a few seconds of free flying.