http://www.popcap.com/promos/2011/zuma/free/?icid=zumafree_HP_PLARGE_pc_EN
for subscribing to a newsletter. If you are already subscribed you still get it for free. For example I signed up again and it told me that I was already subscribed, but they still wanted me to have Zuma so I checked my e-mail and I found an e-mail and got it for free.