Use the Left Mouse button to level up skill.
Use the Right Mouse button to delevel skill.
Use the Shift+Left Mouse button to maximize the level.
Use the Shift+Right Mouse button to reset the level.
Clicking on the Skill serie (row icon) max out all the skill on that row.
Clicking on the Skill tree icon max out all the skill on that tree.
Please click "Load Chinese Skill" or "Load Europe Skill".

This page can take a while to download, please be patient 800KB-1200KB