it is a shortened term for 'maple(mation) battl royale' it is when two or more animators compete with eachother, making a medium of their desired topic and then once the deadline meets, they upload both of them and then the members on the website, like me and you go and vote who you think made the better form of medium.
yeah, you do need an MBR profile (one for each thing youre applying for, one for animtion, one for sprite, etc) before you can actually challenge another.
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