Board Thread:Game Discussion/@comment-10101308-20130527171521/@comment-9477730-20130529024319

It's not level based, I'm at lv 99 and I have been trying to maintain within lv2-3 rumble for 1 cube kill within 20k points.

Based on most previous event, it's point based. Although I sometimes think the rank also affects it. Also the bosses is also released base on the day of the event.

Such as Lv 6 Starscream/Megatron probably hasn't been released yet.