I'm babysitting a 2 year old boy and a 4 year old girl. I've babysat for the kids before but, ran out of ideas to play in the process. I need games ideas that I can play with them together while keeping them entertained.
Let them make it up. Sit down with them and tell them you want to play and ask them what they like and then let them create the games they want or play what they enjoy. When I used to babysit it worked great :)