I like the idea, but it would have to be like the mini game would have to be available once you built any wonders. Not different ones for different wonders as not everyone wants or needs every wonder. Needs change as you go through the chapters as well and it wouldn't be fair if only certain wonders got the bonus games. Also you have to research wonders, so higher chapters would have access to more games then a new player, so that would have to be addressed.