how to make my game darker?

Questions & Answers
1

I have tried turing the ambiant lighting down in the render settings but it has made no difference

http://img.skitch.com/20101202-rwm2gwt8adrutw3fatc2juje32.medium.jpg

2

I have no experience using spritemanager but if you're game is done using sprites then lighting should have no effect on them at all, you just need to modify your spritesheets to make them darker.