To celebrate Mar10 Day (an annual Mario celebration on March 10), LEGO and Nintendo have seemingly joined forces on a Mario figure of some sort.

Nintendo’s twitter posted the cryptic caption saying, “Something fun is being built!” LEGO has a similar mysterious post with only “It’s-a me, LEGO Mario!” a clip showing an LED-lit Mario figure standing on top of a Question Block, with a digital “?” roulette scrolling up on his chest.

The full unveil of what the two brands are cooking should happen later this month.