When the snail appears you'll have the chance to collect rewards simply by watching videos. Simply tap on the snail and then select “watch” and an available video will display. Watch the video until the end, then select the “x” and the game will return to the prize wheel. Select “claim” to spin the wheel and get a prize!
Please note that video availability can vary depending on location, device, connectivity and a range of other factors. Sometimes you may run out of available adverts, try checking back again later!