Are you familar with Kims Game, The memory testing game where the participants as groups observe the items on display for a period of time, and then the items are covered up and then the group must list them.
within a time period.
I have used a variant of it using Nature items on a table with a tag telling what the item is. They can look at the display for 30 seconds. Then they turn around and the tags are removed. The judge then gives the group the tags and has them put them back where they should go. ( use an answer sheet for the judge ). Most correect wins. Use BOLD type written tex