Solution:

The hidden cat is encircled below.

Solution:

39.

Solution:

Tank F.

For an explanation, please visit the video.

Solution:

405

For an explanation, watch the video.

Solution:

38.

Watch the video for an explanation.

Solution:

1

Explanation.
At every step number of joints goes down by 1.
i.e
8 have 6 joints
9 have 5 joints
5 have 4 joints
3 have 3 joints
7 have 2 joints
1 has 1 joint

You can also watch the video for an explanation

Solution:

51

For Explanation, Watch the video.

Solution:

Felice & Nicolas.

The number corresponding to the atomic number of the elements.
26-3-58 (FE-li-ce) =>Felice
28-27-57-16(Ni-co-la-s) => Nicolas.

Also explained in the video.

Solution:

There are multiple solutions to the brain teaser.

1) 11+13+3! = 30
2) 11.5+5.5+13 = 30
3) 11+13+6(rotating 9)... my favorite.

Solution:

The Patient will follow the path from room number-13 to room-no.4 as shown in the picture below.