Lego train with some puzzle [ENDED + solution added]

Recently, I started looking at the puzzles here, and I really liked them, so I wanted to create a similar train myself.
Of course, I quickly realized that I didn't have enough time to create something well-developed, so it turned out a bit rushed. But I hope some of you will still give it a try.
More cars for the train is expected later with the other LEGO games.
(The flavor text sections can be skipped; there are no hidden clues in them.)
Requirement: lvl.1 + some sgt stuff
Closing: August 14

Piece together the torn ticket so you can embark on your journey.

edit: little help added to the harder quiz descrition

SOLUTION:

Chess puzzle: In the top right corner of the jigidi puzzle, there is a QR code that leads to an image. The image contains 8 letter-number pairs that correspond to specific squares on the completed jigidi puzzle. Each square hides a 'chess move' text, for example, 'Rfe8' in square B1. Finally, the moves from the 8 squares indicated on the image had to be entered into the quiz obtained after completing the jigidi puzzle.

Locked door: the 4 number was in the tooltips of the 4 rail coach images