note for self: bit 0 is the rightmost bit.


research was done with USA rev 0 ROM.


the order  object instances are in their respective array defines their location in the levels' "grid". object instances can be half-way between two "grid points" - they don't have to fit 1:1 with a "square".

background, titleset and music is per world, not per level.
the tile "patterns" used for each world are in the floorXX_patterns.bin files (where XX is the world id)


0x0-0x35 seems to be a header or array of dummy/control objects.


starting at 0x30, at the latest, is the array of interactive objects. the last instance in this array in 1-1 seems to be at 0x7B6.
instances are pairs of bytes. first byte is object type. second byte is parameter.
object types:
	01 = nothing?
	02 = nothing?
	03 = mini mario
		parameters:
			00T0000D
			D = is mini mario direction
				0 = right
				1 = left
			T = mini mario type
				0 = normal
				1 = gold
	04 = crash
	05 = nothing?
	2B = nothing? (used)
	B1 = nothing?
	B2 = glitchy
		enemy that catches mini mario when touched? (glitchy graphics in setup i tried it)
	B3 = nothing?
	B4 = starman powerup
		unused, but haven't checked if its offscreen in some level or anything
		no obvious parameters
	B4 = bouncing fireball
		maybe the one spawned by fire mario. don't know if its placed in a level or not.
	B5 = yellow spring
		files:
				data\anims\spring_anim.bin
	6A = piranha plant
		files: 	data\anims\pirahna_plant1_anim.bin
				data\anims\pirahna_Plant1_Ball_anim.bin
		parameters:
			30	0110000		up		?
			68	1101000		down	?
			60	1100000		right	?
			70	1110000		up		?
			38	0111000		up		fireball
			18	0011000		up		no fireball
			08	0001000		down	no fireball
			
			
				
	73 = bouncing candle [world 4]
	9F = blue spring
	FF = nothing?
	
		
0x7b0-0x7ff in 1-1 is part of the array of tile objects. the first instance in this arrway in 1-1 seems to be at 0x7B8.
its not clear how many bytes makes up an instance, but the first byte of each instance seems to describe the object type. 
object types:
	see /tile_objs/


roughly 0x16b8-0x1a77 in 1-1 seems to be the array of collision tiles.


some kind of object array
	2B = goal