makehumancommunity.org

kazank wrote:i don't get the License part...

All license issues are voiced here.
FAQ:Can I sell models created with MakeHuman?

am I allowed to sell a Game were makehumans are used for free?

Yeah.

Do I need to mention Makehuman?

Nope. (I found no such requirement.)

The asset license is CC0. In quick summary this means that you have no obligations whatsoever. You can do whatever you want with the output from makehuman, or actually even with the bundled assets.