The five difficulty curves of chapter 49 — ninety-six levels each.
Left to right is how hard it is; down the page is the level.

0  it never gets harder
    0 ..*
    1 ..*
    2 ..*
    3 ..*
    4 ..*
    5 ..*
    6 ..*
    7 ..*
    8 ..*
    9 ..*
   10 ..*
   11 ..*
   12 ..*
   13 ..*
   14 ..*
   15 ..*
   16 ..*
   17 ..*
   18 ..*
   19 ..*
   20 ..*
   21 ..*
   22 ..*
   23 ..*
   24 ..*
   25 ..*
   26 ..*
   27 ..*
   28 ..*
   29 ..*
   30 ..*
   31 ..*
   32 ..*
   33 ..*
   34 ..*
   35 ..*
   36 ..*
   37 ..*
   38 ..*
   39 ..*
   40 ..*
   41 ..*
   42 ..*
   43 ..*
   44 ..*
   45 ..*
   46 ..*
   47 ..*
   48 ..*
   49 ..*
   50 ..*
   51 ..*
   52 ..*
   53 ..*
   54 ..*
   55 ..*
   56 ..*
   57 ..*
   58 ..*
   59 ..*
   60 ..*
   61 ..*
   62 ..*
   63 ..*
   64 ..*
   65 ..*
   66 ..*
   67 ..*
   68 ..*
   69 ..*
   70 ..*
   71 ..*
   72 ..*
   73 ..*
   74 ..*
   75 ..*
   76 ..*
   77 ..*
   78 ..*
   79 ..*
   80 ..*
   81 ..*
   82 ..*
   83 ..*
   84 ..*
   85 ..*
   86 ..*
   87 ..*
   88 ..*
   89 ..*
   90 ..*
   91 ..*
   92 ..*
   93 ..*
   94 ..*
   95 ..*

1  one step harder every four levels
    0 ...*
    1 ...*
    2 ...*
    3 ...*
    4 ....*
    5 ....*
    6 ....*
    7 ....*
    8 .....*
    9 .....*
   10 .....*
   11 .....*
   12 ......*
   13 ......*
   14 ......*
   15 ......*
   16 .......*
   17 .......*
   18 .......*
   19 .......*
   20 ........*
   21 ........*
   22 ........*
   23 ........*
   24 .........*
   25 .........*
   26 .........*
   27 .........*
   28 ..........*
   29 ..........*
   30 ..........*
   31 ..........*
   32 ...........*
   33 ...........*
   34 ...........*
   35 ...........*
   36 ............*
   37 ............*
   38 ............*
   39 ............*
   40 .............*
   41 .............*
   42 .............*
   43 .............*
   44 ..............*
   45 ..............*
   46 ..............*
   47 ..............*
   48 ...............*
   49 ...............*
   50 ...............*
   51 ...............*
   52 ................*
   53 ................*
   54 ................*
   55 ................*
   56 .................*
   57 .................*
   58 .................*
   59 .................*
   60 ..................*
   61 ..................*
   62 ..................*
   63 ..................*
   64 ...................*
   65 ...................*
   66 ...................*
   67 ...................*
   68 ...................*
   69 ...................*
   70 ...................*
   71 ...................*
   72 ...................*
   73 ...................*
   74 ...................*
   75 ...................*
   76 ...................*
   77 ...................*
   78 ...................*
   79 ...................*
   80 ...................*
   81 ...................*
   82 ...................*
   83 ...................*
   84 ...................*
   85 ...................*
   86 ...................*
   87 ...................*
   88 ...................*
   89 ...................*
   90 ...................*
   91 ...................*
   92 ...................*
   93 ...................*
   94 ...................*
   95 ...................*

2  six steps, sixteen levels each
    0 ..*
    1 ..*
    2 ..*
    3 ..*
    4 ..*
    5 ..*
    6 ..*
    7 ..*
    8 ..*
    9 ..*
   10 ..*
   11 ..*
   12 ..*
   13 ..*
   14 ..*
   15 ..*
   16 .....*
   17 .....*
   18 .....*
   19 .....*
   20 .....*
   21 .....*
   22 .....*
   23 .....*
   24 .....*
   25 .....*
   26 .....*
   27 .....*
   28 .....*
   29 .....*
   30 .....*
   31 .....*
   32 ........*
   33 ........*
   34 ........*
   35 ........*
   36 ........*
   37 ........*
   38 ........*
   39 ........*
   40 ........*
   41 ........*
   42 ........*
   43 ........*
   44 ........*
   45 ........*
   46 ........*
   47 ........*
   48 ...........*
   49 ...........*
   50 ...........*
   51 ...........*
   52 ...........*
   53 ...........*
   54 ...........*
   55 ...........*
   56 ...........*
   57 ...........*
   58 ...........*
   59 ...........*
   60 ...........*
   61 ...........*
   62 ...........*
   63 ...........*
   64 ..............*
   65 ..............*
   66 ..............*
   67 ..............*
   68 ..............*
   69 ..............*
   70 ..............*
   71 ..............*
   72 ..............*
   73 ..............*
   74 ..............*
   75 ..............*
   76 ..............*
   77 ..............*
   78 ..............*
   79 ..............*
   80 .................*
   81 .................*
   82 .................*
   83 .................*
   84 .................*
   85 .................*
   86 .................*
   87 .................*
   88 .................*
   89 .................*
   90 .................*
   91 .................*
   92 .................*
   93 .................*
   94 .................*
   95 .................*

3  all the difficulty in the first twelve levels
    0 ...*
    1 ....*
    2 .....*
    3 ......*
    4 .......*
    5 ........*
    6 .........*
    7 ..........*
    8 ...........*
    9 ............*
   10 .............*
   11 ..............*
   12 ..............*
   13 ..............*
   14 ..............*
   15 ..............*
   16 ..............*
   17 ..............*
   18 ..............*
   19 ..............*
   20 ..............*
   21 ..............*
   22 ..............*
   23 ..............*
   24 ..............*
   25 ..............*
   26 ..............*
   27 ..............*
   28 ..............*
   29 ..............*
   30 ..............*
   31 ..............*
   32 ..............*
   33 ..............*
   34 ..............*
   35 ..............*
   36 ..............*
   37 ..............*
   38 ..............*
   39 ..............*
   40 ..............*
   41 ..............*
   42 ..............*
   43 ..............*
   44 ..............*
   45 ..............*
   46 ..............*
   47 ..............*
   48 ..............*
   49 ..............*
   50 ..............*
   51 ..............*
   52 ..............*
   53 ..............*
   54 ..............*
   55 ..............*
   56 ..............*
   57 ..............*
   58 ..............*
   59 ..............*
   60 ..............*
   61 ..............*
   62 ..............*
   63 ..............*
   64 ..............*
   65 ..............*
   66 ..............*
   67 ..............*
   68 ..............*
   69 ..............*
   70 ..............*
   71 ..............*
   72 ..............*
   73 ..............*
   74 ..............*
   75 ..............*
   76 ..............*
   77 ..............*
   78 ..............*
   79 ..............*
   80 ..............*
   81 ..............*
   82 ..............*
   83 ..............*
   84 ..............*
   85 ..............*
   86 ..............*
   87 ..............*
   88 ..............*
   89 ..............*
   90 ..............*
   91 ..............*
   92 ..............*
   93 ..............*
   94 ..............*
   95 ..............*

4  up for sixteen, down for sixteen
    0 ...*
    1 ....*
    2 .....*
    3 ......*
    4 .......*
    5 ........*
    6 .........*
    7 ..........*
    8 ...........*
    9 ............*
   10 .............*
   11 ..............*
   12 ...............*
   13 ................*
   14 .................*
   15 ..................*
   16 .................*
   17 ................*
   18 ...............*
   19 ..............*
   20 .............*
   21 ............*
   22 ...........*
   23 ..........*
   24 .........*
   25 ........*
   26 .......*
   27 ......*
   28 .....*
   29 ....*
   30 ...*
   31 ..*
   32 ...*
   33 ....*
   34 .....*
   35 ......*
   36 .......*
   37 ........*
   38 .........*
   39 ..........*
   40 ...........*
   41 ............*
   42 .............*
   43 ..............*
   44 ...............*
   45 ................*
   46 .................*
   47 ..................*
   48 .................*
   49 ................*
   50 ...............*
   51 ..............*
   52 .............*
   53 ............*
   54 ...........*
   55 ..........*
   56 .........*
   57 ........*
   58 .......*
   59 ......*
   60 .....*
   61 ....*
   62 ...*
   63 ..*
   64 ...*
   65 ....*
   66 .....*
   67 ......*
   68 .......*
   69 ........*
   70 .........*
   71 ..........*
   72 ...........*
   73 ............*
   74 .............*
   75 ..............*
   76 ...............*
   77 ................*
   78 .................*
   79 ..................*
   80 .................*
   81 ................*
   82 ...............*
   83 ..............*
   84 .............*
   85 ............*
   86 ...........*
   87 ..........*
   88 .........*
   89 ........*
   90 .......*
   91 ......*
   92 .....*
   93 ....*
   94 ...*
   95 ..*

