[Part 2]: All keys in chapter 1: 4 keys. (Full walkthrough). (but without cheese). 

[Part 2]: All keys in chapter 1: 4 keys. (Full walkthrough). (but without cheese).
You can play as well to get full cheese and get full keys.
0:00 Intro
0:02 Start playing
0:06 White key
0:30 Green key
0:53 Find the 4-digit code: 3842
1:38 Yellow key
2:09 Find all 6-green buttons
4:09 Grey key
4:43 Let's go to the red-question mark place
5:12 Purple key
5:56 Press the green button
6:10 Red cheese (until we give to the rat)
6:59 Outro
Thanks for watching!