Purify metal.  Make more money. Win!
And how do you do that? With stoichiometry!  
Students play in groups of up to six students collecting dimensional analysis cards to build complete stoichiometry calculations from metal ore to pure metal.  Students are required to make sure that the units are correct and that mole ratios are right.  Be careful, some of the cards have bad information on them!
After a student collects a set from ore to metal, they apply a percent yield to their calculation.  The more metal they produce, the more money they earn.  
Which ore will they go after?  Silver is the most valuable, but is so rare.  Iron isn't very valuable, but the calculation starts at moles of ore, so they can smelt it faster.
Who will be the Metal King?  Better yet, who will be the Stoichiometry King?
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