Mind Games/Mental stimulation

Any suggestions what games I can play with Harry please. We already play hide and seek with treats but I'm at a loss what to do to stimulate him more mentally.

All training games are good for them, even the basic of sit, lay, up, tummies. I do them in a routine and change it every time, get her to do 5/6 commands in quick succession, then tugsies for a few mins then back into it.

I just do hand signals and she understands but makes it harder, you can not speak, trains you and them

I also play hide and seek with tobys toys. Then play a quick game of tug until he or i is worn out

Normaly make him wait upstairs while i hide things down stairs and visa verser. Then call him to find it

Short training sessions on basic commands and than move on to harder ones.

We play hide and seek and it's works really well. Then just silly things like sit, paws, down etc.

He also does this thing where he lies down in front of me and when I bounce the ball to him he jumps and knocks it back to me. Although I didn't train him this, he sorta trained me lol.