Otherwise, create your own image and use the Browser plugin "Go to URL" action.
The URL to use is something of :
"https://twitter.com/intent/tweet?original_referer=XXX&text=My%20score&tw_p=tweetbutton&url=YYY"
Sorry i am new to twitter. To go mygame for example, I have to put in the message: "@MyGame My score 1000" for example or do not put the