Yo, someone plz recommend me a manga that has mind battles like death note, One Outs, Liar Game etc

Usugui is really good 🙂

This is actually a really common request! And I've answered several threads of this nature before.

Here's one asking for something similar to Kaitani Shinobu's works.

And here's one asking for psychological manga.

This one asked for three different things in one thread, but their third request for strategy fits what you're looking for.

And those are just the ones I've posted in! There's probably more if you do an actual forum search.

Of those, I just want to add a few more I've read since then:
Kakegurui
Kuro no Tantei (if you want a traditional detective story)
Ouja no Yuugi (if you want strategy warfare to be turned into a fighting manga)
Tatoe Hai ni Natte mo
Tomodachi Game (if you want lots of ridiculously overdone backstabbing)

But all my previous recommendations still stand.