Very good leveling guide v2.0

Lvl 1 - 4

Lvl 4 - 8

Lvl 8 -9 (Not recommended)
 
Lvl 9 -13

Lvl 13 - 15

Lvl 15 -20 (Not recommended)

Lvl 15 -20

Lvl 20 - 22 

 Lvl 22 - 26

Lvl 25-30 (Not recommended) 

Lvl 25-28 

Lvl 28 -31 (Multi-cave)

Lvl 31 - 34

Lvl 34 - 37 (Multi-cave) 

Lvl 35 - 40 (Not recommended)
 
Lvl 37 - 40

Lvl 40 - 47 (Multi-cave)

Lvl 43 - 45

Lvl 45 - 48 (Not recommended) 

Lvl 44 - 49 (Multi-cave)

Lvl 49 - 51

Lvl 52 - 55 (Multi-cave)

Lvl 45 - 60 (Multi-cave)

Lvl 55 - 58 (Not recommended) 

Lvl 58 - 61

Lvl 61 - 64

Lvl 64 - 65
 
Lvl 50 - 70 (Not recommended)
 
Lvl 67 - 74 (Multi-cave) (Need better pills)
 
Lvl 70 - 75 (Multi-cave)
 
Lvl 75 - 80 (Not recommended)
 
Lvl 76 - 82 (Multi-cave)

Lvl 85 - 89 (NRec - Too hard, need hight HP)
 
Lvl 82 - 85 (Multi-cave)

Lvl 85 - 90 (Not recommended)

Lvl 85 - 87

Lvl 78 - 90 (Best way - 1-2k exp each)
Lvl 90 - 93 (Multi-cave)

Lvl 93 - 95 (Multi-cave)

Lvl 95 - 96 (Not recommended)

Lvl 95 - 97 (Multi-cave)

Lvl 97 - 103 (Multi-cave)

Lvl 103 - 105 (Multi-cave)

Lvl 95 - 100 

Lvl 105 - 108  (Only at war 100-105 / 105-112, not RC)
 
Lvl 106 - 107 (Multi-cave)
 
Lvl 107 - 108

Lvl 104 - 112 (Best way, Multi cave)

Lvl 115 - 116 (Not recommended, low exp)

Lvl 115 - 121 (Multi cave, best way)

Lvl 121  - 124 (Too hard, not RC)
 
Lvl 124 - 127 (Multi-cave)

Lvl 127 - 129 (Multi-cave)

Lvl 129 - 130 (Dont know, sorry)

Lvl 130 - 133 (Multi-cave)

Lvl 133 - 135 (Not recommended)

Lvl 135 - 142 (Multi-cave)

Lvl 142 - 145 (Multi-cave)

Lvl 145 (Recommended to advance to G1 (lvl 146)

Remember guys, one of the best things to advance lvls (levels 112+) is to winning wars.

Hope i helped