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Monster Levels (By Area)
    No1    No2    No3    No4    No5    Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4    H5
1. 
67%    |         |         |         |          |       |        |         |        |        |       |        |       |       |
2.  
77%    |         |         |         |          |       |        |         |        |        |       |        |       |       |
3.  
85%    |         |         |         |          |       |        |         |        |        |       |        |       |       |
4.  
91%   |         |         |         |          |       |        |         |        |        |       |        |       |       |
5.  
96% |         |         |         |          |       |        |         |        |        |       |        |       |       |
6.  
98%   |         |         |         |          |       |        |         |        |        |       |        |       |       |
7.  
98%    |         |         |         |          |       |        |         |        |        |       |        |       |       |
8.  
96%    |         |         |         |          |       |        |         |        |        |       |        |       |       |
9.  
93%    |         |         |         |          |       |        |         |        |        |       |        |       |       |
10.
89%   58%    |         |         |          |       |        |         |        |        |       |        |       |       |
   No1    No2    No3    No4    No5    Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4    H5
21. |         82%
94%   |         |          |       |        |         |        |        |       |        |       |       |
22. |         |       
92%   82%   |          |       |        |         |        |        |       |        |       |       |
23. |         |       
91% 89%   7%      |       |        |         |        |        |       |        |       |       |
24. |         |         89% 
95% 10%    |       |        |         |        |        |       |        |       |       |
25. |         |         90%  
92% 67%    |       |        |         |        |        |       |        |       |       |
26. |         |         89%  
95% |          |       |        |         |        |        |       |        |       |       |
27. |         |         86%  
97% |          |       |        |         |        |        |       |        |       |       |
28. |         |         |        
98% |          |       |        |         |        |        |       |        |       |       |
29. |         |         |        
99%   |          |       |        |         |        |        |       |        |       |       |
30. |         |         |       
95% 80%    |       |        |         |        |        |       |        |       |       |
    No1    No2   No3    No4    No5     Ni1   Ni2   Ni3     Ni4    Ni5   H1    H2     H3   H4   H5
11.
82%   67%   |         |         |          |       |        |         |        |        |       |        |       |       |
12. 74%  
77% |         |         |          |       |        |         |        |        |       |        |       |       |
13. |        
83%   |         |         |          |       |        |         |        |        |       |        |       |       |
14. |        
89%   |         |         |          |       |        |         |        |        |       |        |       |       |
15. |        
92% |         |         |          |       |        |         |        |        |       |        |       |       |
16. |        
94% |         |         |          |       |        |         |        |        |       |        |       |       |
17. |       
94% 83%   |         |          |       |        |         |        |        |       |        |       |       |
18. |        
93% 91%   |         |          |       |        |         |        |        |       |        |       |       |
19. |         92%  
95%  |         |          |       |        |         |        |        |       |        |       |       |
20. |         87%  
95%   |         |          |       |        |         |        |        |       |        |       |       |
   No1    No2    No3    No4     No5    Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4    H5
31. |         |         |        
90%  83%   80%  |        |         |        |        |       |        |       |       |
32. |         |         |         83%   
86%   82%  |        |         |        |        |       |        |       |       |
33. |         |         |         |         
88% 85%  |        |         |        |        |       |        |       |       |
34. |         |         |         |         
90% 88%  |        |         |        |        |       |        |       |       |
35. |         |         |         |         
92% 90%  |        |         |        |        |       |        |       |       |
36. |         |         |         |        
94%   93%  |        |         |        |        |       |        |       |       |
37. |         |         |         |          94%  
95% 80%  |         |        |        |       |        |       |       |
38. |         |         |         |          94%  
97% 82%  |         |        |        |       |        |       |       |
39. |         |         |         |          92% 
98% 84%  |         |        |        |       |        |       |       |
40. |         |         |         |          88%  
99% 86%  |         |        |        |       |        |       |       |
  No1    No2    No3    No4    No5     Ni1   Ni2    Ni3    Ni4     Ni5   H1    H2    H3    H4    H5
51. |         |         |         |         |          |       |       
95%   90%   85%  |       |        |       |       |
52. |         |         |         |         |          |       |      
94% 92%   87%  |       |        |       |       |
53. |         |         |         |         |          |       |        93% 
94%   88%  |       |        |       |       |
54. |         |         |         |         |          |       |        91% 
95%   90%  |       |        |       |       |
55. |         |         |         |         |          |       |        87%  
97%   91%  |       |        |       |       |
56. |         |         |         |         |          |       |        80%  
99% 92%  80% |        |       |       |
57. |         |         |         |         |          |       |        |       
100% 93%  81% |        |       |       |
58. |         |         |         |         |          |       |        |       
100% 95%  82% |        |       |       |
59. |         |         |         |         |          |       |        |       
100% 95%  84% |        |       |       |
60. |         |         |         |         |          |       |        |      
100% 95%  85% |        |       |       |
  No1    No2    No3    No4    No5     Ni1    Ni2    Ni3    Ni4    Ni5   H1   H2    H3    H4    H5
41. |         |         |         |         82% 
99% 89%  81%   |        |        |       |        |       |       |
42. |         |         |         |         |        
97% 91%  83%   |        |        |       |        |       |       |
43. |         |         |         |         |         
93%  93% 85%   |        |        |       |        |       |       |
44. |         |         |         |         |          84% 
94% 87%   |        |        |       |        |       |       |
45. |         |         |         |         |          |       
96% 88%   |        |        |       |        |       |       |
46. |         |         |         |         |          |       
97% 90%   81%  |        |       |        |       |       |
47. |         |         |         |         |          |      
97% 92%   83%  |        |       |        |       |       |
48. |         |         |         |         |          |      
97% 94%   85%  80%  |       |        |       |       |
49. |         |         |         |         |          |        94% 
95%   86%  82%  |       |        |       |       |
50. |         |         |         |         |          |        88% 
95%   88%  83%  |       |        |       |       |
    No1    No2    No3    No4    No5     Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4    H5
61. |         |         |         |         |          |       |        |       
99% 94%  87%  |        |       |       |
62. |         |         |         |         |          |       |        |       
93% 92%  88%  |        |       |       |
63. |         |         |         |         |          |       |        |         |        89% 
90% 81%  |       |       |
64. |         |         |         |         |          |       |        |         |        86% 
91% 82%  |       |       |
65. |         |         |         |         |          |       |        |         |        80% 
92% 83%  |       |       |
66. |         |         |         |         |          |       |        |         |        |       
94% 84%  81% |       |
67. |         |         |         |         |          |       |        |         |        |       
95% 86%  83% 80% 82%
68. |         |         |         |         |          |       |        |         |        |       
97% 87%  84% 81% 83%
69. |         |         |         |         |          |       |        |         |        |      
98% 88%  85% 82% 84%
70. |         |         |         |         |          |       |        |         |        |       
98% 90%  86%  84% 85%
  No1    No2    No3    No4    No5    Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4    H5
71. |         |         |         |         |          |       |        |         |        |       
99% 91%  88%  85% 86%
72. |         |         |         |         |          |       |        |         |        |       
99% 92%  89%  86% 88%
73. |         |         |         |         |          |       |        |         |        |      
98% 93%  90%  87% 89%
74. |         |         |         |         |          |       |        |         |        |        92%
95% 91%  88% 90%
75. |         |         |         |         |          |       |        |         |        |        82%
96% 93%  90% 91%
76. |         |         |         |         |          |       |        |         |        |        |      
97% 94%  91% 92%
77. |         |         |         |         |          |       |        |         |        |        |      
98% 95%  92% 93%
78. |         |         |         |         |          |       |        |         |        |        |      
99% 96%  93% 93%
79. |         |         |         |         |          |       |        |         |        |        |      
99% 97%  94% 94%
80. |         |         |         |         |          |       |        |         |        |        |      
99% 98%  96% 94%
   No1    No2    No3    No4    No5     Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4     H5
81. |         |         |         |         |          |       |        |         |        |        |       95% 
99% 97%   95%
82. |         |         |         |         |          |       |        |         |        |        |       89% 
99% 98%   96%
83. |         |         |         |         |          |       |        |         |        |        |       81% 
99% 99% 96%
84. |         |         |         |         |          |       |        |         |        |        |       |        96%
100% 96%
85. |         |         |         |         |          |       |        |         |        |        |       |        91%
100% 95%
86. |         |         |         |         |          |       |        |         |        |        |       |        83%
100% 93%
87. |         |         |         |         |          |       |        |         |        |        |       |        |      
100% 87%
88. |         |         |         |         |          |       |        |         |        |        |       |        |      
95%   |
89. |         |         |         |         |          |       |        |         |        |        |       |        |      
88%   |
90. |         |         |         |         |          |       |        |         |        |        |       |        |      
76%   |
  No1    No2    No3    No4    No5     Ni1   Ni2    Ni3    Ni4    Ni5    H1    H2    H3    H4    H5
91. |         |         |         |         |          |       |        |         |        |        |       |        |      
57% |
92. |         |         |         |         |          |       |        |         |        |        |       |        |      
38% |
93. |         |         |         |         |          |       |        |         |        |        |       |        |      
24% |
94. |         |         |         |         |          |       |        |         |        |        |       |        |      
12% |
95. |         |         |         |         |          |       |        |         |        |        |       |        |       |      
7%
96. |         |         |         |         |          |       |        |         |        |        |       |        |       |      
7%
97. |         |         |         |         |          |       |        |         |        |        |       |        |       |      
7%
98. |         |         |         |         |          |       |        |         |        |        |       |        |       |      
7%
99. |         |         |         |         |          |       |        |         |        |        |       |        |       |      
7%
CHARACTER EXPERIENCE
The following chart was created with the help other D2 enththusiasts who left the information on the internet. The percents in YELLOW indicate the most experience points you can gain at your level for any act in the game from level 1 through 99.
Stay in Act I
Progress into Act II at Clvl 12 and Act III at Clvl 19
You should stay in Act III until Clvl 24
Act V should be advanced to at Clvl 32. The chart indicates the best time for you to go into Nightmare is Clvl 37.
Act II Nightmare at around Clvl 43, Act III Nightmare at Clvl 49
You only have about 4 Clvl's in Nightmare Act III until you should jump into Nightmare Act IV at Clvl 53.
Finally, Act V Nightmare at Clvl ?, wait there's a jump straight into Act I Hell at Clvl 63
Blizzard was talking about the difficulty of leveling up after Clvl 70. You can still get good experience at this level, but your increase from one level to the next takes a monster jump. So eventhough you can still get the points, it's getting harder to advance. Jump into Act II Hel at Clvl 74
OK, now you start to see diminishing returns on experience, but not until Clvl 90. Act IV Hell should taken on at about Clvl 83.
Now it starts to really suck. Take on Act V Hell at Clvl 96 and that's your best bet for experience points from then on!
The Experience chart would apply to your Mercenary as well.
Just a side note. If you wanted to know why people wait until level 25 to do Normal Baal runs, look at the dismal experience points you'll get going there too soon!
Normal

Levels  
01 - 11   Act 1
Levels  
12 - 17  Act 2
Levels  
19 - 23 Act 3
Levels 
24 - 31   Act 4
Levels   32 - 36   Act 5
Nightmare

Levels 
37 - 43 Act 1
Levels  
44 - 48 Act 2
Levels  
49 - 52 Act 3
Levels  
53 - 62 Act 4
Levels  
skipped Act 5
Hell

Levels  
63 - 73 Act 1
Levels
74 - 80   Act 2
Levels 
81 - 83   Act 3
Levels  
84 - 94   Act 4
Levels  
95 - 99   Act 5
Quick reference guide. For more information see charts below
Monsters by Acts / Treasure Classes