Board Thread:Plants vs. Zombies 2/@comment-36150238-20180719211035

Hi, first of all as I am new to this nice Wiki site,  sorry if I am asking an inappropriate question orin a wrong place.

Then, I have downloaded the last version of plants vs zombies 2 on my Samsung tablet (Android),

In the youtube, I have realised that some player have played a level containing Yeti or a cool level called Holiday Mashup.

Ho I can find these levels for my son to play?

if there were in older versions, how I can download older versions?

If these are related Hacks, is it OK to use them?

Thank you in advance 