Please take a look on your files... they are
game_gamename_tar.zip
.TAR is a file-extension like .zip .rar ect.
You uploaded some .zip-Files and so the Arcade can not detect any .tar-file!
Where did you get those files ?!
Try to rename one game:
game_chainreactionJS_tar.zip ==> game_chainreactionJS.tar
Then check if the game can be imported via AdminCP, if so, just rename all the files ...
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