NOTE: the pciture shows sir stack with three stack blocks missing so all sir stack's attacks can be seen
Weakness: Using whatever the top block's symbol is ( in the case of the picture hammer ) will destroy the top block, BUT when sir stack has only 3 stack blocks left the shutters on the stack blocks will close and you'll have to remember the top one
Attacks: When he has all stack blocks he will ram you if the bottom is hammer he will ram you normally BUT if the bottom is a boot ( like in the picture ) the other stack blocks will jump off it and you will defend by jump, when he has at least ONE stack block missing he can do three more attacks, laxer eyes ( first background block ) throw bombs ( second block ) or drill under you ( third block ) BUT he will block you're screen with steam before he does so, so you'll have to remember the order of his attacks
Other: When sir stack has no stack blocks he will learn another attack where the stack blocks show a number on them and then show you either a spike ball or a mushroom, Then the stack blocks will fly above you and drop the item. also sir stack will try to explode after he has no stack blocks and has taken enough damage
Health: this boss has about 5000 hp and is weak to the thunder hand ( because it's a robot )
http://s15.postimg.org/p44zpo91n/sir_stack.png