RAAARRRR!  Another guide!  Yay?  Maybe…everyone liked my last one…
Anyway.  This guide is going to describe ways to increase your success in drilling EVEN IF YOU’RE NOT A SENSE TYPE.  Actually, it should help you ESPECIALLY if you’re not a sense type!

  • Note to other experienced players: If you want to help by contributing info on map soil types/depths, it would be much appreciated~! ^^
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The essentials:
How to drill:

  1. Talk to Marky** for a free Basic Drill, or buy one from Item Girl.
  2. Go to your Items panel (hit “i” while not in the chat box)
  3. Click the drills tab
  4. Double click a drill, OR drag it to the drill slot on your Equipment panel (hit “e” while not in the chat box)
  5. Hit “D” while not in the chat box
  6. Click the ground

**

What drill should you use?
I’m going to source from http://www.mytrickster.net/wiki/index.php/Category:Drill  for this section.  Feel free to explore the page yourself, as it will have more info.

  • Basic Drill It’s good for all types of soil.
    Level Requirement:
    1
         Max Depth: 20m
    Life Span: 1300
  • Sand Drill (1, 2, 3, 4) – Special purpose drill designed for sand.
    Level Requirement:
    1/10/30/60
    Max Depth: 20m/30m/60m/100m
    Life Span: 100
  • Land Drill (1, 2, 3, 4) – Special purpose drill designed for grass, land and volcanic areas.
    Level Requirement:
    1/10/30/60
    Max Depth: 20m/30m/60m/100m
    Life Span: 100
  • Rock Drill (1, 2, 3, 4) – Special purpose drill designed for rock and metal.
    Level Requirement:
    1/10/30/60
    Max Depth: 20m/30m/60m/100m
    Life Span: 100
  • Green Drill Special Drill Stage 1. Suitable for hard soils including ordinary brown soil, rocky soil and grass.
    Level Requirement:
    10
    Max Depth: 40m
    Life Span: 200
  • Blue Drill 1st Special drill suitable for all kinds of soil.  (<
    Level Requirement:
    10
    Max Depth: 80m
    Life Span: 100
  • Yellow Drill 2nd special drill. Proper for all kinds of soils.
    Level Requirement:
    20
    Max Depth: 120m
    Life Span: 80
  • Pink Drill 2nd Grade drill special proper for wet soil like deep-sea sedimentary soil and clay soil.
    Level Requirement:
    30
    Max Depth: 60m
    Life Span: 100
  • Cleaner Drill 1st grade drill proper for soil like sand.
    Level Requirement:
    20
    Max Depth: 30m
    Life Span: 300
  • Blend Drill1st grade drill proper for wet soil like deep-sea sedimentary soil and clay soil.
    Level Requirement:
    20
    Max Depth: 30m
    Life Span: 300
  • Multi-Point Drill 1st grade drill proper for thick soil like usual yellow soil, rock soil, and grass.
    Level Requirement:
    20
    Max Depth: 30m
    Life Span: 300
  • Tornado Drill2nd grade drill proper for fragil soil like sand.
    Level Requirement:
    40
    Max Depth: 60m
    Life Span: 400
  • Jet-pump Drill 2nd grade drill proper for wet soil like deep-sea sedimentary soil and clay soil.
    Level Requirement:
    40
    Max Depth: 60m
    Life Span: 400
  • Multi-Pistol Drill 2nd grade drill proper for think soil like usual yellow soil, rock soil and grass.
    Level Requirement:
    40
    Max Depth: 60m
    Life Span: 400
  • Diamond Drill3rd grade drill proper for thick soil like usual yellow soil, rock soil and grass.
    Level Requirement:
    60
    Max Depth: 90m
    Life Span: 900
  • Chaos Drill Ultimate drill proper for stone tiles, wood board and artificial floor.
    Level Requirement:
    80
    Max Depth: 120m
    Life Span: 600
  • Musume Drill Luxury handcrafted drill made by Sigujilly, the craftsman in drill industry.  Good for yellow soil.
    Level Requirement:
    50
    Max Depth: 150m
    Life Span: 200
  • Gao Drill Handcrafted drill made by Mr. Gyujang, the craftsman in drill industry.  Good for artificial soil.
    Level Requirement:
    50
    Max Depth: 180m
    Life Span: 150

That’s all well and good, right?  But how do you know what kind of soil is what?  Well, no offense, but I hope that to some degree, you can tell just by looking.  I mean, grass is obviously grass, dirt is obviously dirt, sand is obviously sand, and so on.  But there are a few areas that can be tricky to figure out.  So for simplicity sake, I will just go through and list as many as I can.
Coral Fields
10m max depth
Loose/Fragile soil.  SAND.
Land/GRASS.
Wood boards.  ARTIFICIAL.

Dark Cave
20m max depth
Just like mines, caves have a strange soil type.  It’s both ROCK and ARTIFICIAL.

Desert Beach Fields
10m max depth
SAND.
Land/GRASS.
Wood boards.  ARTIFICIAL.

Pyramid Dungeon    20m max depth (Excluding Tut…I need to know the depth at Tut.  ^^)
Don’t be fooled.  It looks like tiles, but is actually SAND.

Crystal Copper Mine
20m max depth
Mines have a strange soil type.  It’s both ROCK and ARTIFICIAL.

Emerald Forest
20m max depth EXCEPT for Northwest Forest, which has 50m
Land/DIRT.
Land/GRASS.

Poppuri Dungeon
30m max depth
Land/GRASS.
Mud/Sedimentary.  WET SOIL.  (Yeah, they throw you for a loop with that one.  Sticking in puddles that are a different soil type!)

Caballa Relics Fields
40m max depth
Land/DIRT.
Stone tiles.  ARTIFICIAL.
Land/GRASS.

Caballa Dungeon
60m max depth, including Tombeth.
Land/DIRT and GRASS.
Stone tiles.  ARTIFICIAL.

Jade Steel Mine
130m max depth.
Mines have a strange soil type.  It’s both ROCK and ARTIFICIAL.

Swamp Fields
40m max depth EXCEPT in the “Maze of Forest” fields, which have 120m, and Tenterlion, which has 200m max.
Land/GRASS.
For some reason, the lily pads count as WET SOIL.

Swamp Dungeon
120m max depth EXCEPT on floor 5, which is 250m max.
Clay soil/Sedimentary.  WET SOIL.  (Some parts may count as GRASS too.)

Silver Jewel Mine
160m max depth
Mines have a strange soil type.  It’s both ROCK and ARTIFICIAL.

Warf Fields
80m max depth
Stone tiles.  ARTIFICIAL
Metal.  ARTIFICIAL.
Asphalt/ROCK.  Also ARTIFICIAL.
Wood boards.  ARTIFICIAL.
Land/GRASS.
It looks like water, but it counts as ROCK or ARTIFICIAL.

Path to Mermaid Palace
80m max depth
Just like mines, caves have a strange soil type.  It’s both ROCK and ARTIFICIAL.  Path to Mermaidmight also count as DEEP-SEA SOIL.

Phantom School
50m max depth on F1 and F2, 80m max depth on F3, 120m max depth in the Annex and Mad Ray.
Stone tiles.  ARTIFICIAL.
Wood boards.  ARTIFICIAL.
Vines and leaves/Land/GRASS.

Rose Garden
80m max depth
Stone tiles.  ARTIFICIAL.
Land/GRASS.
Wood boards.  ARTIFICIAL.

Vamp Dungeon
80m max depth, with 60m max at Count Blood.
Carpet/Stone tiles.  ARTICIFIAL.

Mermaid Fields
80m max depth
DEEP SEA SEDIMENT.
Shell/Stone tiles.  ARTIFICIAL.

Mermaid Dungeon
100m max depth
Stone tiles.  ARTIFICIAL.

Mirage Island
80m max depth
Land/DIRT.
Land/GRASS.
Wood boards.  ARTIFICIAL.
SAND.
ROCK.  Might also be artificial, I’m not totally sure.

Mirage Dungeon
100m max depth
DEEP SEA SEDIMENT.

Snow Fields
120m max depth
SNOW.
Ice/SNOW.

Ice Dungeon
180m max depth, except at Odinea, which has 200m max.
Ice/SNOW

Precious Jewel Mine
200m max depth
Mines have a strange soil type.  It’s both ROCK and ARTIFICIAL.

Techichi Volcano
180m max depth, except at Soki, which has 200m max.
Volcanic ash/Land/DIRT.
Volcanic ash/Land/DIRT and possibly ROCK.
Wood boards.  ARTIFICIAL.

Tapasco Volcano
150m max depth, 250m max at Spicy
Volcanic ROCK.

Cherry Blossom Fields
20m max depth
Land/DIRT.
Land/GRASS.
Stone tile.  ARTIFICIAL.
Rugs and cushions.  ARTIFICIAL.

OK, if you’re not a sense type, or if you’re a low level sense type, drilling can be hard.  There ARE things you can do to increase your chances of successfully finding things.
    The first thing to understand is how DA helps you drill.  High DA will keep you from drilling where nothing is buried.  DA will alert you if you are or are not drilling a spot where something is buried.
  Something is there!  See the light bulb over my head?  That’s DA at work!

  There’s nothing there!  See the squiggly over my head? That’s DA at work too!
All class types will get the light bulb or squiggly from time to time.  The higher your DA, the more often you will get those reactions.  At 90 DA, you will get the light bulb/squiggly 100% of the time.

Next, you need to know how items tend to spawn.  They usually spawn in overlapping grids.  When you find an area with a lot of buried items, it’s a “hotspot”.

That’s a picture of a small hotspot.  I put the arrows on it to point out a very important fact. If you find a hotspot, dig in strait horizontal or vertical lines.  As you can see from the image, that’s how they line up.
Where are the best places to find hotspots?  Believe it or not, on or around portals are great places to find things.

Things also tend to spawn around landscape objects such as trees, bushes, stumps, rocks, statues, etc.  Landscape objects vary from map to map.

Edges of maps also tend to be good places to find buried items.


There’s one more thing you need to know.  I have a technique I’m going to share with you all that I’ve never really seen/heard anybody else mention.  I’ve even had people argue that I’m wrong about it, but I’ve tested it and tested it, and nearly all of my guild mates have used this technique sucessfully.
Items land on other items.  When you dig up an item there’s a very decent chance it will land on OR near something else buried!  I would estimate it happens about 60% of the time.  It’s not constant, so don’t expect results 100% of the time.  But if you’re a sense type that hasn’t yet learned Basic Detect, or if you’re not a sense type at all, this technique can be very helpful!
I even made a little slide show demonstrating it working!  ^__^

Detect Skills
There are currently 2 Detection skills.  They make red targets appear on the ground to show where stuff is buried.  (They can be seen in nearly all my screen shots.)  Only sense type characters can learn them.
First is Basic Detect, which can be learned by both lions and foxes at TM35.
http://www.mytrickster.net/wiki/index.php/Sense_Skills 
Directly pasting the info, here:

Basic Detection

Icon Name TM Level Skill Type Learn Mastery Mastery Item Prerequisite
Image:Basic Detection.jpg
Basic Detection
35
On/Off
2
2
None
Detects where items are underground.
Formula
DA * Increase %
Level
MP
Cool Down Time
Duration
Depth it Detects
Area of Detection
1
10
2 seconds
1 second
50 meters
3*3
2
11
2 seconds
1 second
55 meters
4*4
3
12
2 seconds
1 second
60 meters
4*4
4
13
2 seconds
1 second
65 meters
4*4
5
14
2 seconds
1 second
70 meters
5*5
6
15
2 seconds
2 seconds
75 meters
5*5
7
16
1 seconds
2 seconds
80 meters
5*5
8
17
1 seconds
2 seconds
85 meters
5*5
9
18
1 seconds
2 seconds
90 meters
6*6
10
19
1 seconds
2 seconds
95 meters
6*6
Master
20
1 seconds
3 seconds
110 meters
7*7

Next is Item Detector, which can be learned by Explorers at TM55 or Cyber Hunters at TM105
http://www.mytrickster.net/wiki/index.php/Explorer_Skills 
Pasting directly again.

Item Detector

Icon Name TM Level Skill Type Learn Mastery Mastery Item Prerequisite
Image:Item Detector.jpg
Item Detector
55(Cyber Hunter = 105)
Timer
4
3
Detects items underground in a 3×3 area deeper than Basic Detection.
Formula
Ratio x DA
Notes
May fail.
Level
MP
Cool Down Time
Duration
Ratio
1
50
15s
9s
3
2
54
15s
11s
3.5
3
58
15s
13s
4
4
62
15s
15s
4.5
5
66
15s
17s
5
6
70
15s
19s
5.5
7
74
15s
21s
6
8
78
15s
23s
6.5
9
82
15s
25s
7
10
86
15s
27s
7.5
Master
98
15s
33s
9

Item Detector is the skill I’m using in the screen shots.  Some people dislike it, because of its tendency to fail.  Also, I will give fair warning to anyone who chooses to learn this skill: When ever there is an event that requires drilling, Item Detector gets a temporary nerf that causes it to FAIL MORE OFTEN.  I don’t know how many other people have noticed that, but I sure as heck have!  >[

Other helpful skills
While Basic Detect and Item Detector are the only detection skills currently, they’re not the only ones that assist with drilling.  Sixth Sense boosts DA, and can be learned by both foxes and lions at TM1.
http://www.mytrickster.net/wiki/index.php/Sense_Skills 
Another direct paste.

Sixth Sense

Icon Name TM Level Skill Type Learn Mastery Mastery Item Prerequisite
Image:Sixth Sense.jpg
Sixth Sense
1
Timer
2
2
None
Increases DA for period of time
Formula
DA * Increase %
Level
MP
Cool Down Time
Increase %
Duration
1
80
10 seconds
10%
60 seconds
2
100
10 seconds
13%
65 seconds
3
120
10 seconds
16%
70 seconds
4
140
10 seconds
19%
75 seconds
5
160
10 seconds
22%
80 seconds
6
180
10 seconds
25%
85 seconds
7
200
10 seconds
28%
90 seconds
8
220
10 seconds
31%
95 seconds
9
240
10 seconds
34%
100 seconds
10
260
10 seconds
37%
105 seconds
Master
300
10 seconds
45%
120 seconds

    Invincible Drilling is a skill that allows you to drill uninterrupted even if you’re attacked.  This skill can be learned by both lions and foxes at TM1.  However, I will give you a warning: If you’re in an area where things can kill you in 2 hits, Invincible Drilling could cost you your life by keeping you from instantly reacting or running away.  However, it is a VERY useful skill, and there is no reason not to learn it.  Just use caution in dangerous areas.  😉
If any more drilling assistance skills are added, I will edit them in at that time.  ^^

Phoneuma:
Soil Types Sound Effects: You can tell the soil type when you drill. Sometimes you can tell before you start, right after you click where you want to drill. While your drill is in idle mode, listen closely to the sound it makes. Grass, Sand and Rock types typically make the same sound and so are hard to distinguish. Wood tends to yield a hollow sound. Metal and Tile will cause your drill to make a high-pitched ratchety sound. Watery types will make a bubbly bloopy-bloop sound.  Snow I think has a unique sound as well, perhaps muffled. Need someone to verify this info, though.
Tree Troves: Basic Detection and Item Detector cannot be seen through tree leaves, so be sure to check behind trees even if you see Sense characters drilling in the area. Odds are they overlooked the forested areas.
Hidden Areas: You can drill off the maps if you know where to look. I won’t reveal any locations because then I would have a more Fdrilling in my secret spots. Technically still on the map, there are places where you can drill that are outside the standard walkable map grid. I call these places Hidden Areas because sometimes you can’t even see your character while drilling.
X Marks The Spot: If you find a good place to drill, make note of it. Places like the Music Room in Phantom School have hotspots in the same areas. On some occasions, those hotspots may yield very valuable finds. For example, one morning I drilled up 13 Metronomes in a row, then 7 Canvas 2’s, then 7 Canvas 3’s, then 7 Canvas 1’s, and a couple exceptional equips which I NPCed for 40k+ galder.

Credits:
    Theou
He gave me the boss depths, more tips, and reminded me of missed areas.
    Zephyr        He suggested I put the skill info in in the first place.
    Tuvis
He suggested I include the value of DA needed for 100% chance of lightbulb/squiggly.

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Additional Guide Tips Welcomed!