Board Thread:Game Updates/@comment-1820055-20150412042349/@comment-25196231-20150428010915

185.47.220.70 wrote: "Only  jumping up two difficulty levels is not allowed". That's not true, you genius. How about you actually read the tweet? Easy -> Hard -> Hard is OK. You have to do medium or hard on every map from and including E-2 to unlock hard on the following map. 例)【OK】丙→乙→甲 例)【NG】丙→丙→甲

The two lines above is copied from the Dev's twitter post, translated the 【NG】part for us again. NG= no good