Everyone has a different definition of the word fun. Although there are definite definitions that have been recognized by researchers about having fun, there is no standardization for a feeling like when enjoying having fun. Fun is something relative and to get it, everyone has their own way. When time passes quickly until you don't realize it, it can be one example that you are having fun.
One popular way especially among children to have fun is playing puzzles. Because children are at the age of craving for playing. Puzzles are something new for the brain so children feel fun while doing it. But for some people who like something mediocre and do not like challenges or activities like completing puzzles, they can not feel fun while doing it. There are people who find it difficult when doing puzzles so choose to do other activities and that’s fine. Puzzles, not suits for everyone anyway. But for those who really enjoy doing puzzles, some of these people can be addicted to playing.
When playing puzzles don’t give you any sense of fun, don't worry. There is nothing wrong with you. Some puzzles do sometimes even stress you out because it's hard to solve them. You might be able to try selecting puzzles at a very easy level. Because at that level, it's very easy to solve them. That can be guaranteed by the companies that make it. But when you feel very bored and don't want to do puzzles, just don’t do it. Because it will further depress you and there will be no fun you get. You might try playing puzzles with your favorite person as an option to have an interest in doing it.
Having fun is called the way to get stress release. This relates to relaxing. Relaxing gives relief to several parts of the body so that the burden can be set aside for a moment. Relaxing is similar words with stress release. When you have some fun, the effects it receives on the body are varied. There are those who can take it with ease, there are also those who have fun by turning it into something that stimulates adrenaline and is challenging. So the effect of having fun on the body is not the same for everyone. But certainly, stress release can be produced when having fun.