In Final Fantasy: Mystic Quest, you will come across little grey tile areas you can enter. These are called battlefields.
In battle fields, you will fight ten sets of enemies, to get EXP, GP, or even a rare item or spell. This is where the majority of your experience comes from in the beginning of the game.
Below is a list of the battlefields, and what your rewards, and enemies are. The "MAP #" represents the number on the map below the table. This will give you the location of the battle field you are looking for.

MAP #

BATTLEFIELD #

ENEMIES

REWARDS

3

1

Mad Plant, Poison Toad

54 Exp

5

2

Basilisk, Mad Plant, Poison Toad

Charm

6

3

Basilisk, Minotaur Zombie, Sand Worm

150 GP

9

4

Mint Mint

99 Exp

11

5

Mint Mint, Giant Toad

300 GP

12

6

Mint Mint, Giant Toad, Scorpion

Magic Ring

14

7

Edgehog, Giant Toad, Scorpion

99 Exp

16

8

Desert Hag

600 GP

18

9

Desert Hag, Lamia, Mage

540 Exp

20

10

Sphinx, Phanquid

Exit spell

21

11

Freezer Crab, Gather

744 Exp

23

12

Jelly

900 GP

24

13

Jelly, Sting Rat

Gemini Crest

25

14

Plant Man

816 Exp

27

15

Sting Rat, Plant Man, Flazzard

1200 Exp

29

16

Flazzard, Red Cap

Thunder spell

31

17

Red Bone, Ghost, Zombie

1200 Exp

34

18

Iflyte, Stheno

1086 Exp

40

19

Ooze, Skuldier, Water Hag

2808 Exp

40

20

Water Hag, Vampire

2700 Exp