Fusion

There have been several changes to the fusion formula since the game was released. Originally there were different costs to fuse cards with a N, N+, and R card. It also cost less to fuse cards one at a time compared to fusing them simultaneously; however, there was a small bonus when fusing multiple cards at one time compared to fusing them individually. Currently (4/18/2012), there is a flat cost for fusing cards depending on the Base Slot's level.

Avoid fusing multiple cards simultaneously because multiple level jumps during fusion can result in not receiving the appropriate level up bonus. For example: this can result in a Level 6 card having Level 5 stats.

The following table lists the costs to fuse a N card with a R card, the growth of the R card when a N card of the same zombie type is fused with it, and the growth if a N card with a different zombie type is fused with it, and is accurate as of the 4/17/2012 update.

N+ cards fused with a R card receive a +10% bonus to Growth. For example: When a N card is fused with a Level 10 R card, the R card grows by 45%. When a N+ card is fused with a Level 10 R card, the R card grows by 55%.

R cards fused with a R card receive a +20% bonus to Growth. For example: When a N card is fused with a Level 10 R card, the R card grows by 45%. When a R card is fused with a Level 10 R card, the R card grows by 65%.

Cards fused with a R+ card receive a -10% penalty to Growth. For example: When a N card is fused with a Level 10 R card, the R card grows by 45%. When a N card is fused with a Level 10 R+ card, the R+ card grows by 35%.

After the Base Slot Card reaches Level 18, any N card fused with it will provide only 5% Growth.