Doro!

Doro! (Japanese: ドロー) is a simulation game about drawing cards from a 4-color deck of 100 cards. Cards are laid out in column. Each one of them has 1/4 of its width shaded at location based on its color, and covered by the card above it. To draw cards from the deck, keep tapping on the shaded regions nonstop from the top of the deck. And, to challenge yourself, try to have no cards left in the deck in under 10 seconds.