The Cubastic challenge is a challenge designed by youtuber @CUBASTIC which I competed in at Ukrainian nationals 2023, it requires the solver to solve the cubes and use them as pieces on a tic-tac-toe grid, if you can solve the cubes faster then you get to place your pieces down quicker which gives you an advantage, but you still have to make sure you are placing them in the best place otherwise you can easily let your opponent win! All that is required to play this game is a friend that averages about the same at 3x3 and 10 3x3 cubes