Full Health was an extreme difficulty stamp in Club Penguin. In order to obtain this stamp, the player had to reach a bonus round in Card-Jitsu Snow that requires all ninjas to be at full health at the end of the third round. A good way to do this is for a snow ninja to use power cards to heal all ninjas before the third round ends.
This stamp was released on May 23rd, 2013, along with other Card-Jitsu Snow stamps.
The other two types of requirements for unlocking a bonus round, reaching it within a time limit, or having no ninjas be knocked out in battle, do not have stamps, unlike this one.
This stamp is a bait item if a player attempts to perm it.