There are 4 stages for newbies to understand how food safety in Blockchain Stage 1: It is to earn 1000 coins by playing simple game. Stage 2: let users to buy given food product with use of earned coins Stage 3: let users to find reasons why purchased food is contaminated ,looking through the history of the food product in blockchain , meaning one of good features is transparent. During stage 3, user can see the history of food cannot be modified as strong feature of blockchain. Stage 4: let user to experience the limitation of blockchain which is slow transaction Basically, when user buy food, they need to wait for some period until the transaction is done.