Thank you AZJIO,
It's super beautiful but I have more than 300 games (these are games that are around twenty years old, BigbFish or Reflexive Arcade or others but that children really like.
I will therefore present the categories on the left (Match 3, Mahjong, Brick Breakers, Puzzles, Reflection, Reflexes, Bubble, etc...)
By clicking on a category, all the games in this category will be displayed in another area to the right of the categories.
By clicking on the name of a game, I will display screenshots of that game on the right side of the screen.
There will also be a button to put a game in another "My favorite games" area. I use a PanelGadget for this.
Of course, when a game is selected, there will be a button to launch it...
Here's my idea, I started coding and I like it the way I do it.