Training

Champions will level up naturally by playing them, but the hard work can be skipped by using the "Train" function to level up immediately. However, other champions will need to be sacrificed as training materials, often referred to as "food" or "fodder". Training is also used for upgrading the skills of a champion.
==Training Fuzzlepuff==
	
The Training Fuzzlepuff is a special type of food that grants bonus XP based on its level. 
To take advantage of this ability to the fullest, it should always be leveled to max (Level 10) before use. Since it cannot be brought on adventures, the only way to level it up is to train it.
Availability: PvP shop, Event shops, loot drop from all Bull Demon King boss raids
==Super Fuzzlepuff==
	
This is a variant of the Training Fuzzlepuff which comes at max level and provides 4 times more XP than a level 10 Training Fuzzlepuff would.
Availability: Guild Wars shop, Event shops
==Max Fuzzlepuff==
	
Introduced in Update 7, this is yet another variant of the Training Fuzzlepuff which instantly levels up a champion to max when used. The obvious use for it is to max level a 6 stars level 1 champion.
Availability: Event shops
 
==Fuzzlepuff Guide (by Grundor)==
Should you buy them?
Training Fuzzlepuffs
You can purchase 1 of them every day from the PVP shop. I personally recommend buying them instead of the discs. In order to afford 7 of them a week, you need to play enough 5v5 (MOBA) and/or Arena matches.
Otherwise, you can get them for free from Bull Demon Kings. Technically, the only time you should farm for them is the last week of every month when the Double Elixirs boost is on.
Super Fuzzlepuffs
It is almost never recommended to buy them.
Max Fuzzlepuffs
Only buy them if you have the spare event currency and nothing else better to buy. 
Conclusion
While the idea of instantly maxing out your long-awaited champions is tempting, I would advise leveling up by farming XP in adventures. In the early and mid game, you use a farmer in a board scenario. In late game when you can defeat a boss using just 3-4 champions, you can do leveling in boss raids using the empty slots in your team.
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