Puzzletrain - All aboard! [Solutions posted :-)]

Hello again dear SG people :-)

This time my best friend Kju and I made some giveaways for you and together we created puzzles for each one. It is a puzzle train :-) The train contains 8 puzzles and giveaways – bundled and non-bundled games.
To reach the first puzzle you have to find the letters for the ITH link in this picture. The letters are ordered like occidental comic book speech bubbles ^^.

Please don’t share any links or answers, you would break my heart if you do this.
We will both listen to you if you have any problems and help as well as we can but won’t provide any answers.

You have time until wednesday, may 6th 23:00pm (GMT+1)

Feel free to bump this thread and tell me what you think about the puzzles. I want feedback to improve the quality of future puzzles :-)!

EDIT: Manual for the poké-picture - The letters for the link are ordered line by line from left to right
HINT for P1: WHAT is love? Think rational, no emotions. Use Google + brain
HINT2 for P1: nice picture
HINT3 for P1: What are the building blocks of everything?

Major Updates (27.4.):

P2: I know it's much, but it is not hard, so keep on solving ;-)
P3: General advice - You need a tool to solve this puzzle.
P4: Added some more hints I omitted the last time I updates this puzzle ^^
P5: Ehm..Here I added some hints too. I think is is clear when you see them.
P6: Nothing new. Everything is fine ^^ Same rule as in P2.
P7: Changed some hints - hopefully to more precise ones :D
P8: Same as for P7. I also added a second hint for some questions.

New small Update (4.5.)

P1: If you don't get it now, I can't help you anymore :-/
P8: New hints and/or altered existing ones.

Here are the solutions to every puzzle - I included the link to the puzzles as well, so you can have a look at them :-)

Puzzle 0 – Finding and arranging the code to the first puzzle

Puzzle 1 – Love (= Chemistry)

28 = Nickel
71 = Lutetium
111 = Roentgenium
36 = Krypton
87 = Francium
52 = Tellur/Tellurium
93 = Neptunium
12 = Magnesium
46 = Palladium
64 = Gadolinium

Puzzle 2 – Sudoku

Sudoku1
Sudoku2
Sudoku3
Sudoku4
Sudoku5
Sudoku6
Sudoku7
Sudoku8
Sudoku9
Sudoku10

Puzzle 3 – Rainbow!

47aac3
9a0c7a
42e012
e0a812
24e3b4
180e44
f93d3d
fdfade
510ba0
533c3c

Puzzle 4 - Reise Reise

Iceland/Island
New Zealand/Neuseeland
Hungary/Ungarn
Nigeria
Paraguay
Fiji/Fidschi/Republic of Fiji
Belarus/Weißrussland
Cambodia/Kambodscha
Panama
Zimbabwe/Simbabwe

Puzzle 5 – Bird is the Word

Solution

Puzzle 6 – Can you catch’em all?

Knofensa/Bellsproout/Madatsubomi
Seeper/Horsea/Tattu
Raichu
Abra/Casey
Knuddeluff/Wigglytuff/Pukurin
Sandamer/Sandslash/Sandpan

Puzzle 7 – Art Atack!

Gustav Klimt
Vincent van Gogh
Franz Marc
Claude Monet
Frida Kahlo
Henri Rousseau
Friedensreich Hundertwasser
Marc Chagall
Albrecht Dürer/Albrecht Duerer
Pablo Picasso

Puzzle 8 – It’s all about Music

The Legend of Zelda: Ocarina of time
Portal
Braid
Banjo – Kazooie/Banjo-Kazooie/Banjo Kazooie/BanjoKazooie/Banjo and Kazooie
The Elder Scrolls IV: Oblivion
Pokemon Red/Pokemon Blue/Pokemon Red Edition/Pokemon Blue Edition/Pokemon Yellow/Pokemon Yellow Edition/Pokémon Red/Pokémon Blue/Pokémon Red Edition/Pokémon Blue Edition/Pokémon Yellow/Pokémon Yellow Edition/Pokemon Red Version/Pokemon Blue Version/Pokemon Yellow Version/Pokémon Red Version/Pokémon Blue Version/Pokémon Yellow Version
Magicka
Final Fantasy (Here VII as example)
Super Mario Land
Super Metroid

Phew..that’s all ^^ See you to the next puzzle :-)