If you have access to computers, laptops or Chromebooks, an excellent activity at centers is to let your students practice keyboarding skills. I updated my Participate Learning collection with resources for teachers. I also put together a Symbaloo - this would be easy to allow students to access from a center and practice their keyboarding skills. Most websites on the Symbaloo are to typing games, but check out Typing Club or Typing.com (at the bottom of the Symbaloo) for leveled activities. I would recommend using a combination of both leveled activities and keyboarding games with your students.