Funny you brought this up. I was just Googling “Observation games” and “Memory games”. It’s fun to do some of these exercises to test your memory. I can recall in school we’d have a picture to look at for about 30 seconds then we’d have to answer questions from memory about what we had seen. Great exercises and fun to do. Thought they’d have some of those online, but can’t find any.
Well you inspired me to Google....so try this one:
http://www.bangor.ac.uk/~mas009/neurogym/shterm.htm
Sorry....meant to add....what I Googled on was “short term memory exercises”. Got a lot of hits.