co-open is a FPS (first person shopping) game in which you play as a child who is sent by their grandmother on their first independent grocery run. Aside from your casual shopping experience, it also has other places to explore, and a variety of characters with small cute personal quests.

The playthrough length and outcome will differ based on how much you are willing to explore and what you end up buying, so the game may take anywhere from 10 minutes to 3-4 hours to complete.