There is an unequivocally optimum path through the game, and while you can't purchase every upgrade there is, you can pretty easily get every one that's worth having. (metacritic.com)
We understand that their first fast reactors will use oxide or carbide fuel rather than metal — a less than optimum path, chosen presumably because the PUREX reprocessing technology is mature, whereas pyroprocessing has not yet been commercially demonstrated. (scientificamerican.com)
They found that when the optimum path to a fly ball is followed, the former angle increases at a variable rate, slowing over time, whereas the latter angle increases at a constant rate. (scientificamerican.com)