Hide and Seek!!! It's also a great way to reinforce Come with increasing distance and distractions.
I personally distinguish between Stay (I return to you to release you) and Wait (I may release you from a distance, or you may get up on your own).
I put Cooper in a sit or down wait, then move to the other end of the room and call him. Repeat with increasing the distance and your dog's ability to see you. Work up slowly to such feats as finding you behind furniture, up/down stairs, under a blanket, etc. Start these harder ones by letting them see where you go, then calling. When the dog does not see where you have gone (later on), call a second time if needed to locate you by sound.
If your dog is easily distracted, start slowly, or have another human help him with a long line (I used to teach Come this way in a pet store⦠lots of fun to see them searching the food aisles for their owners!).
You can also use another human staying with the dog to teach such commands as "Go see Mom/Dad" or "Go upstairs/downstairs." Have the human with the dog give this command just before the hiding human calls the dog.