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This is a list of all the possible remaining un-used animation frames I found in all the animation data banks. The game does not call these with any code.
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unused frames remaining
$2A000 area ---

unused frame ids:

flash man stars, no animation data
20: flash man stars
21: flash man stars

pointer 84B8: 00 08 AF
AF: get hit frame - the frame is NOT unused, but animation data is. Most likely was intended for a wily boss, either megaman clone, yellow devil, or one of the wily forms. 

pointer 84B5: 00 08 BE
BE: another un-used water bubble, wily 1 boss - Probably for the turtles, but it is supposed to be 2 frames, not 1.

pointer 853F: duplicate of 2A087/2A107
This is the ONLY single spot for 1 free animation space
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unused frames remaining
$34000 area ---

unused frame ids:
00 08 23
23: a large graphic of megaman seen from his backside. See my explanation here:
https://themechanicalmaniacs.com/articles/mm3mysteries.php#Graphics

pointer 8386: 00 08 24
24: unknown

66: duplicate of 67 (submarine enemy) - bank E

pointer 8496: 00 08 74
74: unknown, maybe energy item frame

00 08 9A
9A: mysterious type of platform!? - bank 9

D0-D6: duplicate of D7 water splash, free space

FF: unknown glitch, does not belong to ANY graphic page

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unused frames remaining
$36000 area ----

un-used protoman shooting while on ground
03 06 1F 20 21 22

un-used protoman's custom "get hit" animation
09 02 25 3A 3A 25 3A 3A 25 3A 3A 25

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un-used breakman shooting while on ground
03 06 32 33 34 35

un-used breakman's custom "get hit" animation
09 02 39 3A 3A 39 3A 3A 39 3A 3A 39

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un-used water bubble, found right next to rush marine data. Un-fortantely, it's missing 1 frame.

00 08 A0
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A type of block, but tiles are arranged wrong for some reason.
pointer 847D: 01 06 C4 C5
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a copy of spinning top frame 1, at end of Top Man. But no animation.
00 02 D5
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remaining un-used frame ids:

8A, 8B: stars for halographic enemy. the game does not load sprite objects for them. It's done through code, same with flash man stars.
