Thread:Ragnarok6354/@comment-25856250-20150227142728/@comment-25090105-20150227152139

To level their skill up, there are two ways I know of See this link for more info
 * 1) Practice with members who have identical skill.
 * 2) Practice with members who are meant to level skill up.

Timing window is the range of time to achieve certain hit judgments (Perfect, Great, Good, etc). Say, the timing window for perfect is 0.2 seconds. It means if you hit the note earlier or later than 0.2 seconds of the time it's supposed to be hit, you will not get perfect.

The skill "ease the timing window" basically turns all Goods and Greats to Perfects for a limited time.