Time for a long puzzle. I believe it’s überhard, we’ll see if I'm right. At the end there will be one winner that can choose a game for 20€ (not 50 this time :/). There are giveaways on the road and you must leave a comment on those. 31st is the end date of the giveaways. I'm a mathboy so the texts aren't so good.

An old uncle of yours died some time ago and left a big chest to you. It contained all the things he collected during his travels around the world. He used to be an adventurer before he was injured in an accident. One day, after looking at the interesting things in the chest, you find a tiny envelope at the bottom of it. In it is a note written in your uncle’s writing. It says:

 g1g2 i9k20e8v9h5x4d1j8 T1 D5 G214 52 Y2?

Solution

g+1=h
g+2=i

i+9=r
k+20=e
e+8=m
v+9=e
h+5=m
x+4=b
d+1=e
j+8=r

T+1=U
D+5=I
G+214=M
5+2=7
Y+2=A

"hi remember UIM7A" Which leads to my previous Treasure Hunt

I wanted you to use the same method on this clue. Book

g1g2i9= page 1, row 2, word 9= Search
k20e8v9= my
h5x4d1= give
j8T1D5= away
G21452Y2= s

"Search my giveaways"

So if you search among my old giveaways you'll find this:

"You find another note.

When you read this I'll be gone. Don't feel sad about it, my life has been good. I understand you found the clue I left for you. There are still many ahead. Things of great value wait at the end so I need to talk in riddles. Be sure not to tell anyone about the things you find out.

2 In the middle (or the outskirts) of Madrid you will find what you need, the Madrid-Barajas Airport.
1 Look at the shape of it (the Madrid-Barajas Airport), what letter would you say that is? Place it first. (It's a K, not a single k in the whole of Spain)
3 Take a plane from there and land among the stone-cactuses, in the end it's the capital . Take a southbound train from there.
4-5 Then start in a country that was almost ruled by the United Fruit Company and end in the former Brittish of the two.

Comment here too if you want.

Now it should be a bit easier."

1. K
2. d (Madrid)
3. O (Mexico)
4. G (Guatemala)
5. e (Belize, former British Honduras)

First giveaway I'll post that solution there soon. I give you time to look at it first.