Scratch-off cards can be used for tons of promotional ideas, and if you've ever wondered how to make your own, I'm going to show you how easy it is! I made these Secret Savings cards for a past venture and included them with my orders for a limited time.
Remember the classic computer game Minesweeper? Korean design studio Connect design has ported that over into meatspace. Behold, the scratch Minesweeper post card that you "play" by scratching off squares with a coin. Link - via The Verge .