zombie picture animation: https://www.pinterest.co.uk/pin/37717715617562654/ background: https://co.pinterest.com/pin/466544842641561506/ game over picture: https://www.vectorstock.com/royalty-free-vector/game-over-screen-pixel-retro-games-try-again-and-vector-24365920 Start game image: https://www.goodfon.com/wallpaper/start-game-nachat-igru-start-start-the-game.html
