9 x5's, this is something which I always wanted to do in blockout in large pits. Also he was able to play in level 10 as well and got a x5 when playing at level 10. A bit more practice and he can get the 500K in extended too
Sadly my highest in extended is just 414K
I wish I could get these extraordinary scores in excess of 450K+ too. In 7x7x18 extended, my highest was just 352K