Stellar nucleosynthesis (somewhat simplified): http://newbrict.github.io/Fe26/
Both games are fun, but Fe26 is going to keep me occupied for a long time.
Edit: I'm getting trapped at Mg24. Following the alpha-process, I should be able to stuff in another alpha to get to Silicon, but it's not happening, nor is it listed in the fusion rules below the game. http://en.wikipedia.org/wiki/Alpha_process
Higher elements would still be formed, by the occasional fissioning of Mg by fast alphas/neutrons, but it would change observed nuclear abundances considerably.