Thanks for the feedback! Changing groceries is actually a technique that players can use as an advantage to refresh the groceries. Sometimes they couldn't find the target ingredients on the shelf so they have to refresh the ingredients by themselves. The original idea was actually to make the shelf empty after the player got the right item, and refresh the item when they got it wrong. I considered to put this mechanic in the tutorial but I finally removed it. I re-designed this into whether the player got the item right or wrong, the item gonna be changed and not left empty. I feel like this way would be easier for players to spot this technique by themselves without further talking in the tutorial. Thanks again!