Antidotes are distributed among selected Foursquare categories in a logical manner and can be acquired by simply checking in to that locations. (Image 1)

There are some special collectibles which can be acquired randomly. This feature adds the chance factor to the key action of the game, thus making people curious about the consequences of every checkin. Special collectibles may contain actions or/and rules, like “immune for 3 days” - a special collectible which saves the user from infection for 3 days. (Image 2)