Well, we call them Games, however they are more training tools.
Game 1 trains how to connect two items (Step 1: Association).
This is: Dealing with how long it stays in your memory or the other way around: how fast it comes back (recall).
Game 2 trains how to remember 10 items in correct sequence (Step 2: Location).
This is: Dealing with quantity and how much we remember.
Game 3 trains how to change any word into a picture (Step 3: Visualisation).
This is Dealing with what we want to remember.