Collaboration Stages · Stage 1Nen Nen Kororiねんねんころりこんころり1★ 100%2★ 150%Data updated: 2026-07-2460Energy Cost8,460XP Reward10,000Enemy Base HP5,500Stage Length20Max Enemies2.2Difficulty Build a lineup for this stage Test your team vs this stageEnemy spawns (8)EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotesEyes of Forced Unconscious Sleep (Enemy Base)100000%10s—0%Enemy baseDemon Doge150%∞16.7s33.3s~40s100%—B.B.Bunny100%233.3s40s~46.7s100%—Jackie Peng100%366.7s46.7s~53.3s100%—Sir Seal100%193.3s—100%—B.B.Bunny100%2160s40s~46.7s100%—Enmu100%113.3s—100%BossMs. Sign100%∞900s900s100%—All Mugen Train stages