Try to get as much ATP as possible from one glucose by dragging the substrates onto the belonging enzymes.
Hint: start by dragging glucose and ATP to hexokinase. Don't forget that the NADH and pyruvate transports are active and need phosphorylation. Good luck :)
Need more help or biological reference? Take a look at the Wikipedia pages for glycolysis, citric acid cycle and oxidative phosphorylation. If you still can't figure it out, take a look at the video to see a 'perfect run'.