To prepare for this game, I gathered a number of science themed items from around the house and found a cover for the tray. You can use objects like a battery, magnet, balloons, syringe, matches etc. Place these objects on the tray and cover the tray and place on a table. Allow the kids to look at the tray for a few minutes. Cover the tray back up and take out of the room. Take one object off the tray out of kids’ view and cover back up. Take the tray back to the table and remove the cover. Ask kids which item is missing. Do this until all objects are gone and all kids have a turn of naming a missing object. You can either give points for right answers or remove a child from the game if they answer incorrectly.