One code you might try is (4-2-4) consisting of 4 gold dragons, 2 wilds and 4 golden tigers. While other supporting items can be customized.
Rumor has it, using this strategy and code will lead you to the 12 M jackpot in just 12 spins. However, this rumor has not been confirmed for Higgs DOmino, the truth is the latest Rp. with the X8 Speeder