Bricks, Masonry, Asphalt and Concrete - Painting Concrete

Hoping someone here can help. I will be repainting the concrete play yard for a Kindergarten class. It's currently painted with hopscotch squares and various things for the kids. It is faded and chipping in some areas. I've never attempted such a project and do not know what preparation needs to be done to the concrete (power washing, sandblasting, etc) prior to painting. I also need a recommendation on what type of paint to use.

Thank you for your help
TL

Power wash to remove as much of the old paint as possible. Really blast the concrete. You may want to try a chemicl stripper for any leftover paint.

Consider a concrete stain instead of paint. Stains will not chip like the paint. If you must go with a paint, use a quality epoxy paint.