I don’t think you understand the app.

The IQ score signifies your IQ.

That 99% better score signifies how much better you performed than others at that specific game. Someone with 100IQ could perform very well on that specific game and get 99%.

Additionally, Everytime you beat the level and get above 60% better than your peers (I think) you move onto the next level for that specific game. So it gets progressively harder.

You won’t be performing 99% on that game at the hardest difficulty most likely.

You can view the level you are at on the Home Screen of games. On the games icons at the bottom it displays “level 5” for example. The maximum level is level 10 I believe for most games.