Forests of Training are high difficulty, 0 stamina, 20-stages long battles permanently available at the Extra Isle. Upon completion, the player receives a special item, usually a new ship (and a rainbow gem). A new Forest of Training is added to the game every few months.

In those quests you won't obtain any reward from the enemies except the one-time clear reward for each stage (ship+gem).

Currently the following Forests are available on Global:

The following forest is not yet available on Global, but is available in Japanese version of the game (and likely will become available on Global in the future):

There was one older forest which have been removed from the game. It provided no reward. See Training Forest (no treasure).

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