Unhappy is a casual 2D game about making unhappy people happy. In this game, the player will work through a list of client each real life day. The play must try to make at least 80% of their clients happy. Every client will have different needs and situations that made them unhappy. The player must find solutions for them.

Some client will be really easy to make happy. Simply giving them candies will do the trick. Some will be really hard. For the harder clients, the player will usually need to investigate their homes and surrounding to find what the issues is. None of the clients will directly tell the player their issues. However, giving them candies will usually improve their mood a little.

The player needs to be careful when selecting the right method to help a client. If the player selected the wrong method and end up making the situation worse, the client might suicide. Or the client might harm other people.