The village chief has disappeared. Panic! The tribe needs a new head, but this time, as long as it's done it must be smart (it will change as the other would say) in order to evolve the whole human species (just that)! And this smart head is yours, of course! Except that others think so too, it feels like a fight in the Kroms.
The goal in Krom is to collect diverse and varied resources (bone, wood, stone, Krom, life ...) in order to be able to exchange them for Evolutions cards (which represents your smart head), but not any evolutions, we're talking here about inventing the Cine-Magnon or the Stupid-mouth. Each evolution card give you more or less victory point, depending on the level of "ingenuity" of the invention in order to end the game.
—description from the publisher