This was a really cool concept. I especially loved the tetris game, having to actively work to NOT play Tetris successfully was a really good idea! The pac-man game I didn't like as much, the directional things are sometimes hard to click, and Pac-Man can go very far away from any ghosts, making it hard to reach. Also, the first two times I played it, on the hardest difficulty, pavman just head straight into a ghost and died without me doing anything.
I understood the difficulty, but it was confusing. One thing that was really confusing is that it's from Hardest to Easiest, which just isn't how the language of games work. The hardest difficulty being first made it look like it wasn't a difficulty selector.
Good job overall though!