A simple guide to help you solve the different quests and build the artifacts found in Doodle God, I didn't list the combinations for the main game, there's already a well done guide by MakoSapper if you want these:

http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=536365974

I'm not sure if you need to finish the main game to unlock all necessary elements since i've done them after finishing the main game.

1: Basilik = Lizard + Poison + Stone
2: Eiffel Tower = Metal + Skyscraper + Tower
3: Godzilla = Dinosaur + Radiation + Sea
4: Holy Grail = Blood + Demigod + Resurection
5: Lightsaber = Energy + Light + Sword
6: Pandora Box = Chaos + Darkness + Death
7: Perpetual = Energy + Mechanic + Void
8: Pyramids of Cheops = Corpse + Sand + Stone
9: Ring of Power = Demon + Lava + Magic
10: Santa's Sleigh = Human + Snow + Wood
11: Sphynx = Beast + Human + Stone
12: Stonehenge = Stone + Stone + Stone
13: Titanic = Death + Ice + Ship

Fire + Void = Sun
Fire + Water = Alcohol
Water + Alcohol = Vodka
Fire + Sand = Glass
Magic + Glass = Magic Ball
Sun + Glass = Sunglasses
Water + Metal = Quicksilver
Magic + Quicksilver = Philosopher's Stone
Metal + Philosopher's Stone = Gold
Death + Human = Zombie
Death + Religion = Sacrifice
Alcohol + Grass = Absinthe
Alcohol + Wheat = Beer
Alcohol + Worm = Tequila
Human + Tree = Wood
Human + Zombie = Brain
Human + Wheat = Bread
Music + Wood = Guitar
Metal + Human - Weapon
Human + Weapon = Assassin
Void + Weapon = Death Star
Assasin + Water = Pirate
Pirate + Alcohol = Rum
Assassin + Chaos = Joker

Magic + Book = Spellbook
Human + Magic = Elf
Dwarf + Axe = Warrior
Dragon + Warrior = Steak
Rogue + Dragon = Ash
Warrior + Priest = Paladin
Human + Spellbook = Wizard
Paladin + Wizard = Party
King + Party = Quest
Quest + Dragon = Mountain
Dragon + Mountain = Lair
Dragon + Party = Dead Dragon
Lair + Rogue = Secret Door
Warrior + Wizard = Adventurers
Dead Dragon + Party = Key
Key + Secret Door = Trap
Rogue + Trap = Maze
Maze + Party = Experience; Gold; Princess

Human + Order = Discipline
Death + Life = Resurection
Human + Human = Birth; Love
Human + Work = Diiligence
Human + Religion = Faith
Scientist + Sex = Continence
Priest + Sex = Chastity
Sex + Work = Sublimation
Fun + Human = Cheerfulness
Fun + Money = Donation
Discipline + Vodka = Abstention
Light + Sin = Virtue
Donation + Money = Charity
Money + Human = Gift
Cellphone + Gift = Free Apps
Human + Charity = Generosity
Religion + Meat = Fasting
Human + Virtue = Assistance ; Tolerance
Virtue + Faith = Hope
Faith + Human = Salvation
Pride + Virtue = Modesty
Virtue + Wrath = Humility
Cellphone + Free Apps = Altruism
Fun + Virtue = Joy
Virtue + Energy = Calmness
Water + Bread = Diet
Diet + Grass = Vegetarianism

Human + Island = Beach; Cliffs; Forest
Human + Sea = Water
Human + Beach = Oysters; Palm Tree; Sand
Human + Cliffs = Cave + Stone
Human + Forest = Bushes; Game; Tree
Human + Bushes = Berries; Leaves
Human + Palm Tree = Coconut; Liana
Human + Tree = Leaves; Stick
Stone + Stone = Spark
Leaves + Spark = Bonfire
Stick + Stone = Hammer
Stick + Leaves = Shelter

Here you'll get a map

Hammer + Stone = Flintstone
Stick + Flintstone = Axe
Axe + Tree = Wood
Wood + Bonfire = Ash; Coal; Bonfire
Axe + Stick = Spear
Spear + Game = Carcass
Carcass + Axe = Meat; Skin
Meat + Bonfire = Steak

Here you'll get a knife

Carcass + Knife = Meat; Sinew; Skin
Liana + Liana = Rope
Wood + Rope = Raft
Raft + Sea = Storm
Rope + Stick = Bow; Fishing Rod
Sea + Fishing Rod = Fish
Knife + Fish = Bones; Meat
Human + Skin = Clothes
Human + Map = Hidden Treasure
Rope + Bones = Needle and Thread
Needle and thread + Skin = Canvas
Canvas + Stick = Sail
Raft + Sail = Sailing Raft
Sailing Raft + Sea = Calm
Rope + Forest = Snare
Bonfire + Leaves = Smoke
Meat + Sun = Jerky
Sand + Water = Clay
Clay + Bonfire = Pottery
Clay + Sun = Bricks
Bricks + Bricks = Wall
Wall + Shelter = Hut
Sun + Water = Salt
Human + Hidden Treasure = Compass; Gold; Spyglass
Spyglass + Sea = Black Sail; White Sail
Smoke + Black Sail = Pirates
Smoke + White Sail = Merchants

A note before doing the following one

After I did the one below the quest ended and was marked as succesful, but i still have two things that aren't discovered but I can't do them apparently. So you might wanna try different combinations before doing the last one, i tried to combine merchants and gold but it didn't work. So I did this last one:

Pirates + Gold = Torture

Thanks to MakoSipper , instead of being tortured by the pirates, here are the other options your have:

Pirates + Human = Death
Merchants + Human = Salvation

Bacteria + Medicine = Antibiotics
Cart + Mechanism = Car
Food + Freezer = Frozen Food
Games + Knowledge = Croosword
Air + Earth = Dust
Limestone + Oil = Crayons
Human + Knowlegdge = Lie Detector
Human + Money = Shopping
Human + Void = Astronauts
Food + Time = Fast Food
Knowledge + Time = Theory of Relativity
Air + Fabric = Zeppelin
Paper + Phone = Fax Machine
Shopping + Cart = Shopping Cart
Order + Work = Assembly Line
Void + Electricity = Radiowave
Radiowave + Phone = Cellphone
Shopping + Money = Barcode
Puzzle + Game = Copyright
Debt + Money = Credit Card
Fun + Game = Yoyo
Game + Money = Monopoly
Neon + Electricity = Neon Lamp
Void + Dust = Vacuum Cleaner
Energy + Grass = Tea
Energy + Fire = Plasma
Magic + Order = Software
Void + Plasma = Sun
Energy + Sun = Solar Cell
Tea + Paper = Tea Bag
Car + Air + Airplane
Airplane + Earth = Black Box
Firearm + Magic = AK-47
Sun + Glass = Sunglasses
Human + Fabric = Clothing
Woman + Clothing = Bra
Airplane + Void = Rocket
Radiowave + Music = FM Radio
Work + Mechanism = Robot
Robot + Void = Satellite
Satellite + Radiowave = GPS
Satellite + Satellite = Space Station
Fire + Radiowave = Laser
Radiowave + Airplane = Radar
Mechanism + Money = ATM
Plutonium + Energy = Nuclear Power Plant
Mechanism + Time = Clock
Mechanism + Life = Artificial Heart
Mechanism + Photo = Polaroid
Mechanism + Fire = Jet Engine
Mechanism + Air = Helicopter
Mechanism + Clothing = Zipper
Car + Money = Parking Meter
Rocket + Weapon = Missile
Paper + Knowledge = Book
Photo + Life = 3D Holography
Electricity + Bread = Toaster
Satellite + Space Station = Modular Space Station
Plasma + TV = Plasma TV
Glass + Void = Lightbulb
Fabric + Glue = Band Aid
Fabric + Oil = Cellophane
Paper + Water = Liquid Paper
Clothing + Water = Washing Machine
Rpcket + Water = Sea Launch
Glue + Magic = Super Glue
Cellophane + Music = Audio Cassette
Cellophane + Glue = Duct Tape
Metal + Clothing = Armor
Car + Armor = Tank
Missile + Weapon = Bazooka
Electricity + Knowledge = Semi-conduction
Food + Life = Vitamin
Clothes + Sun = Bikini
Knowledge + Life = DNA
Knowledge + Void = Big Bang Theory
DNA + Knowledge = DNA Fingerprinting
Radiowave + Knowledge = Radio Telescope
Metal + Knowledge = Stainless Steel
Paper + Photo = Photocopier
Neon Lamp + Clock = Digital Clock
Lightbulb + Semi-conductor = Vacuum Tube
Semi-conductor + Electricity = Transistor
Plutonium + Plutonium = Nuclear Bomb
Audio Cassette + Software = Floppy Disk
Fabric + Armor = Kevlar
Food + Fun = Bubble Gum
Floppy Disk + Laser = CD
CD + CD = DVD
Car + Order = Traffic Light
Car + Electricity = Hybrid Vehicle
Car + Void = Moon Lander
Armor + Poison = Gas Mask
Radiowave + Food = Microwave Oven
Book + Software = Hypertext
Software + Transistor + First Computer
First Computer + Photo = Digital Photography
First Computer + Games = Video Game
First Computer + Video Game = Computer Mouse
Digital Photography + Life = Digital Camera
First Computer + First Computer = Internet
Internet + Digital Camera = Webcam
Life + Video Games = Virtual Reality
Internet + Hypertext = WWW
Transistor + Transistor = Micro-chip
Microship + Microship = Micro-Processor
First Computer + Micro Processor = Personnal Computer
Personnal Computer + Software = MS-DOS
MS-DOS + Magic = Windows
Music + Microchip = MP3 Player
Microchip + Book = Flash Memory
Cellphone + Personnal Computer = Smartphone
Flash Memory + Software = Memory Card
Personnal Computer + Order = USB
Air + Freezer = Air Conditioner
Gas Mask + Water = Aqualung
Music + Music = Stereo
Music + Games = Karaoke

Human + Sand = Gold
Human + Stone = Flintstone
Human + Water = Life
Sand + Sand = Desert
Stone + Stone = Fire
Stone + Fire = Metal
Human + Desert = Corpse
Human + Metal = Weapon
Human + Fire = Sacrifice
Human + Sacrifice = Priest
Life + Sand = Sun; Scarab
Life + Stone = Egg
Life + Water = Fish
Egg + Sand = Hawh
Water + Desert = Nile
Nile + Sand = Swamp
Sand + Swamp = Clay
Human + Nile = Field
Human + Sun = Pharaon
Pharaon + Hawk = Horus
Egg + Swamp = Lizard
Life + Nile = Fish; Reed
Lizard + Nile = Crocodile
Pharaon + Crocodile = Sobek
Flintstone + Reed = Papyrus
Fire + Clay = Bricks
Human + Bricks = House
House + Pharaon = Temple
Pharaon + Stone = Statue
Pharaon + Sun = Ra
Field + Life = Beast
Human + Beast = Domestic Animal
Human + Domestic Animal = Meat; Wool
Human + Wool = Fabric
Corpse + Fabric = Mummy
Gold + Mummy = Sarcophagus
Beast + House = Cat
Pharaon + Cat = Bastet.

Air + Angel = Heaven
Earth + Angel = Clay
Clay + Angel = Human
Fire + Angel = Sun
Water + Angel = Sea
Air + Imp = Storm
Clay + Imp = Golem
Earth + Imp = Lava
Fire + Imp = Inferno
Lava + Angel = Stone
Sea + Imp = Swamp
Stone + Imp = Metal
Water + Imp = Alcohol
Stone + Angle = Egg
Imp + Human = Corpse; Warrior
Angel + Sun = Light
Imp + Sun = Radiation
Imp + Light = Darkness
Angel + Egg = Bird
Imp + Bird = Phoenix
Imp + Egg = Dragon
Angel + Metal = Tools
Angel + Radiation = Energy
Angel + Energy = Electricity
Imp + Metal = Gold
Imp + Radiation = Nuclear Bomb
Imp + Tools = Weapons
Angel + Dragon = Dinosaur
Imp + Dragon = Demon
Angel + Dinosaur = Beast
Angel + Beast = Domestic Animal
Imp + Beast = Werewolf
Angel + Domestic Animal = Milk; Wool
Imp + Domestic Animal = Meat; Blood
Imp + Blood = Vampire
Angel + Wool = Clothing
Imp + Milk = Bacteria
Angel + Bacteria = Beetle
Imp + Bacteria = Virus
Imp + Beetle + Scorpion
Imp + Scorpion = Poison
Angel + Swamp = Grass
Angel + Grass = Flower; Tree
Angel + Tree = Forest
Imp + Forest = Treant
Imp + Swamp = Sulfur
Angel + Sulfur = Sand
Imp + Sulfur = Gunpowder
Angel + Sand = Beach

These are all the quests available as of 24th Oct 2015.

Thanks for reading this guide and hopefully it has been helpfull in your Doodle quests.