I also already read metro survive & Tenkuu Shinpan
Here are some :D
http://www.mangago.me/read-manga/gantz/
http://www.mangago.me/read-manga/mouryou_no_yurikago/
http://www.mangago.me/read-manga/blue_heaven/
http://www.mangago.me/read-manga/cage_of_eden/
http://www.mangago.me/read-manga/6000/
http://www.mangago.me/read-manga/apocalypse_no_toride/
http://www.mangago.me/read-manga/hakaijuu/
http://www.mangago.me/read-manga/hive/
http://www.mangago.me/read-manga/real_account/
http://www.mangago.me/read-manga/real_account_ii/
http://www.mangago.me/read-manga/gringo_2061/
http://www.mangago.me/read-manga/doubt_tonogai_yoshiki/
http://www.mangago.me/read-manga/judge/
http://www.mangago.me/read-manga/lives/
http://www.mangago.me/read-manga/duds_hunt/
http://www.mangago.me/read-manga/underdog/
http://www.mangago.me/read-manga/infection/
Oh forget Cage of Eden, havent seen it in your list.
Take some more :D
http://www.mangago.me/read-manga/torikago_no_tsugai/
http://www.mangago.me/read-manga/81_yamada_yuusuke_gekijou/
http://www.mangago.me/read-manga/tomodachi_game/
http://www.mangago.me/read-manga/bloody_junkie/
Ooh Thanks xD I seen everything in your first comment but I haven't read tomodachi game or bloody junkie yet ( owo) I'll give them a try (~ >u<)~ They look really interesting xD Thanks again! X3
You're very welcome. :D I'm sure you'll like them. :D Enjoy~
I just finish reading the updates for Imawa No Kuni No Alice and I really feel like reading some more survival mangas ( -w-) So does anyone have any other recommendation on survival mangas that is not : Btoom!, Battle Royal, Kamisama no Iutoori I & II, Darwin's Game, Suicide Island, Cage of Eden, Green Worldz or Biomeat?