Hi all, the boss is a reward for getting over a x150 combo... Some folk have said that's pretty tricky. The key is to start you chain as early as possible and use the bombs to link if you get out of position. Stay low and try to herd the bullets. @delca yes you can play the game quite safe and surviving, but I try to reward riskier play, longer combos with a boss plus your score all adds up. It's certainly supposed to be one you come back to