I took some time to redo the MERGE game on roadtogrammar.com to make it a little easier for English learners and, hopefully, more fun, too.
The object of the game is still the same, to change one word to another word, one letter at a time.
You can play the new version here: http://www.roadtogrammar.com/merge/
If you prefer the older version, you can find it here: http://www.roadtogrammar.com/merge2/
Screenshot: