Being very honest, as a manga reader, I didn't enjoy this drama that much.
They failed in a lot o aspects in compariso to the source material.
I couldn't bring myself to care for any of the characters. On episode 3 (which in the manga is the part that absolutly destroyed me) the only feling I had towords the characters was desapointmant, it wasn't nearly as emotional as it should have been.
Not to mention the rest of the games and how they changed them, making them simpler and less interesting. Also putting the main characters in games they didn't participate in the manga, basically ignoring Arisu's traumatic experience in the hide and seek game and the ways it affected him psychologically.
Though I liked some especific changes, like the addition of celphones and the aged up main character(witch are teenagers in the manga).
But in the end it wasn't enough to make me enjoy the story.
I will give it someo extra credits for the production, which was quit impressive for a J-drama.
In conclusion: Wouldn't waste my time re-watching and don't know if I would watch a second season.

*Just want to end apologising for any gramatical mistakes*