The level is unlocked. Unlock naturally when it reaches a certain level. Level 5-140 unlocks a new skill every level 3, 140-2 12 unlocks a new skill every level 4. It seems to be gone after 2 12.
Map treasure chest
Small game reward. There are game gyms, fitness gyms and battle gyms, and all kinds of small robots with helmets will bring us new skills.
Get fitness skills. Consume skill points and gold coins. It is recommended to leave enough gold coins for opening skills. Level 40 opens the 5x5 part on the first floor, level 65 opens the 7x7 part on the second floor, and level 130 opens the 9x9 part on the third floor. This is a skill tree structure. To unlock any skill, you must first light up all the previous skills. I'm a little confused about the location number of these three floors. Please forgive me. In 9x9, U stands for top layer, D stands for bottom layer, L stands for left side and R stands for right side).