Warcraft Rumble’s in-game shop is called the G.R.I.D. It offers new Minis, Talents, Boosters, and Exp points in exchange for gold coins. The name “G.R.I.D.” implies how the store works: Items are placed on a 3x3 grid that moves or rotates with each purchase. This rather complex function has made beginner players wonder what items to buy first—and which to avoid.