Difference between revisions of "Super Mario Bros.:Notes"

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(unwritten)
(Castle Hacking)
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'''Hacking the End-of-Level Castles'''
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1) Get some graphing paper, and start cordoning 2x2 squares. Make a 5x5 block of such squares (10x10 overall).
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2) Reading right-to-left, from the top row down, you've got the metatile defined by $17DF, $17E0, $17E1, etc......, $17F7.
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3) This linear string of 25 bytes can be represented on your graph paper like this:
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5 4 3 2 1
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10 9 8 7 6
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15 14 13 12 11
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20 19 18 17 16
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25 24 23 22 21
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(In other words, the first byte in this string codes for the upper-rightmost metatile, the second byte codes for the metatile directly to #1's left, etc.)
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4) The large castles at the end of every X-3 level (and the beginning of most X-1 levels) are simply the small castle stacked on top of another, slightly taller one. This taller castle is 6 metatiles high and five metatiles wide, and is coded in a similar right-to-left, top-down fashion. Its linear byte sequence begins at $17F8.
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5) The little side-sections on the X-3 castle type are actually the same background image that occurs throughout World 8-3. This image is 1 metatile wide and eleven metatiles high (although it only appears to be six metatiles high since the first five bytes are assigned transparent "00" values). Its coding begins at $13CE and ends at $13D8.
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Here are some metatile values to keep handy:
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00: Nothing/Transparent
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45: Castle Top, sky background
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46: Castle Window (left)
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47: Castle Brickwork (generic filler)
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48: Castle Window (right)
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49: Castle Top, brick background
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4A: Castle Entrance (top)
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4B: Castle Entrance (bottom)

Revision as of 21:57, 23 December 2007

Hacking the End-of-Level Castles


1) Get some graphing paper, and start cordoning 2x2 squares. Make a 5x5 block of such squares (10x10 overall).

2) Reading right-to-left, from the top row down, you've got the metatile defined by $17DF, $17E0, $17E1, etc......, $17F7.

3) This linear string of 25 bytes can be represented on your graph paper like this:

5 4 3 2 1 10 9 8 7 6 15 14 13 12 11 20 19 18 17 16 25 24 23 22 21

(In other words, the first byte in this string codes for the upper-rightmost metatile, the second byte codes for the metatile directly to #1's left, etc.)

4) The large castles at the end of every X-3 level (and the beginning of most X-1 levels) are simply the small castle stacked on top of another, slightly taller one. This taller castle is 6 metatiles high and five metatiles wide, and is coded in a similar right-to-left, top-down fashion. Its linear byte sequence begins at $17F8.

5) The little side-sections on the X-3 castle type are actually the same background image that occurs throughout World 8-3. This image is 1 metatile wide and eleven metatiles high (although it only appears to be six metatiles high since the first five bytes are assigned transparent "00" values). Its coding begins at $13CE and ends at $13D8.


Here are some metatile values to keep handy:

00: Nothing/Transparent 45: Castle Top, sky background 46: Castle Window (left) 47: Castle Brickwork (generic filler) 48: Castle Window (right) 49: Castle Top, brick background 4A: Castle Entrance (top) 4B: Castle Entrance (bottom)