Tom: I want to play that game. Koko: It's not possible. Tom: Why isn't it possible? Koko: 1. "Because it is not created yet." - ok 2. It has not been created yet." - Good 3. You can't play a game that is already not created. - nope 4. You can't play a game that has not been already created. - ok You can't play a game that has not been created yet. <-- "yet" better than already. You can't play a game that is yet to be created. <--- I like this one best

"It has not been created yet." = This is the best way to say it. "You can't play a game that has not been already created. " = You should change the word order to "You can't play a game that has not *already* been created."

2 and 4 are correct.