What could be nicer than a motley Christmas tree ball bath during the Advent season on my favourite planet X-Mars 2412? After such a full ball relaxation bath I always feel robo-well. Unfortunately my three robo-friends Caspermyrrh, Incensebalthasar, and Goldmelchior from the planet 0601 did a Christmas joke to me and hid ten of my favourite balls. Slowly but surely it turns nasty!
Could you please help me to mark those balls in the left picture that miss in the right picture?