Hi,

I am looking for a completed manga where mainly a group of school students are transferred to a dystopian world. They have so play games where usually the loser dies. The games are themed after stuff like psychology, intelligence etc. symbolicated by playing cards. In the end the protagonist wins and they have the choice to leave that world or stay. some leave and some stay.

Sounds a lot like Imawa no Kuni no Alice. I hope it is what you’re looking for.

That was it. Thank you very much!