Could anyone help me out here? I have to find out which software lifecycles are used by games companies for a report. thnx in advance if you can help me.

Is it possible to give an example or an explanation of what you mean ?
Software lifecycle ? What do you mean exactly..
Used for game companies as a report ? What kind of report ?

You mean like Waterfall, Iterative, etc.?

Waterfall is basically requirements->design->implementation->testing->release, where each stage of the process happens in order and once a stage is completed you don''t go back.

Iterative can have feedback from later stages feeding into earlier stages (requirements, design, etc.), where you go through the process a number of times. There are other models that I can''t quite remember (Cascade?)

I don''t work in the game industry, but I was helping out with a crude explanation so maybe someone else can help you.