Instructions
Select two or more monster cards that can be fused together and put them in your deck. Each monster card must be at a certain level in order to be fused. (The level needed varies depending on the monster card being created in the fusion.)
During battle, place the two or more monster cards side by side. Note that you cannot place monsters on the field and fuse them in the same turn.
Select one of the cards on your turn and select the "Fuse" option. Your cards will be fused together to create a new card. The two cards you fused will be lost, and the fusion monster you obtained will not be able to be saved to your deck unless you are playing the game's "Campaign" or "Versus" modes.