Stage Difficulties

Some of the event stages are rated by difficulty:
 * Easy (初級 Shokyū)
 * Normal (中級 Chūkyū)
 * Hard (上級 Jōkyū)
 * Veteran (Hard+) (超上級 Chō jōkyū): rated for the Daily Blitz Stages
 * Expert (Hard++) (激ムズ Geki muzu): rated for Super Metal Hippoe (Metal), the first Cat Awakening Stages
 * Insane (Hard+++) (超激ムズ Chō geki muzu): rated for Crazed Cat Stages, the second Cat Awakening Stages
 * Deadly (極ムズ Goku muzu): rated for True Form Crazed Cat Stages