How does Pocket Raiders let the recruits test the castle?

After the boss of the boot trial castle is successfully killed, the level and difficulty of the next trial of BOSS will be improved. If the BOSS is not killed, the level of the BOSS will remain unchanged at the beginning of the next trial.

Players who kill boss in the boot trial castle get a kill reward. After the trial, the ranking reward will be distributed by mail according to the player's total injury ranking.