1 Rock, Paper and Scissors images are from https://www.iconfinder.com/
2 (they are still striped, as printed on the website, since I didn't pay for them)
4 Spock image was found here http://all-free-download.com/free-vector/download/spock-star-trek-cartoon_52494.html
6 Lizard image was found here http://www.symbols-n-emoticons.com/2014/07/likable-lizard.html
8 favicon from here https://fr.findicons.com/icon/441883/applications_games
10 GIF source: https://www.pinterest.com/pin/587930926353765433/
11 (edited with https://ezgif.com/)
13 Question mark: https://fr.m.wikipedia.org/wiki/Fichier:Question_mark_alternate.svg