What game do you recommend I play with my 10-year-old son?

My son, whenever he sees me playing on the PC, always asks to play too. The problem is that what I play is not good for his age.

I wanted to invest in a Wii U, which is much more focused on children, but at the moment we don’t have money.

I know he really likes Harry Potter and that they’ve even made a game. But we can’t play it together.

I also saw that there are Harry Potter board games where we could play together.

What do you think?