My son has been using this for the last two months. He's 2 & 8 months, slightly under the recommended age for it.
As a game, it should have a lot going for it. For a new user, there are a variety of skills tested, from counting (using baseball), to alphabet (using a robot builder), to shape sorting (using piggy banks of different sizes & coins to match).
However, it is quite flawed in many ways. In most games, the instructions on what letter to select, will stop abruptly if a key is pressed or the mouse is clicked.
For example, in the alphabet game, Arthur will say something like, "Hand Brain the upper case letter A", & there are 5 choices. If however, my son happens to click anywhere on the screen, Arthur will stop before the sentence completes & my son will click at random. It's tough to pick a letter if Arthur doesn't say which one is to be picked!
That sort of thing happens in many of the games, so for us, quite a few of them are un-playable.
If you play the games more than a few times, there's not much variety in the games. The almost exact same things happen each time, even if they were completed correctly the last time.
Quite soon, I'm not sure if my son is learning new stuff or simply remembering the game's prompts from previous experience.
Bottom line : Good game with possibilities for a month or so, will become old hat after that.