I will readily admit it. As much as I like
Brain Age, or at least the premise behind it, I lost interest once a new game came along. Sorry, but the idea of keeping up with a game isn't something I am keen on - otherwise I would be charging though a raid in an MMO. My relationship with
Hot Brain was much the same, though I found myself losing interest even faster.
Hot Brain contains a number of brain-bending mini-games that are housed into two structured play types: Practice and Test. Practice lets you go through any of the mini-games and play through them on one of three difficulty levels. The purpose is to get you used to how the mini-games work, so you don't waste time figuring out how things work in Test, where your performance matters. Test Mode is meant as a daily exercise that challenges you with five random games. At the end of the test, you are assigned a brain temperature as a score. The hotter your brain, the better your score.
Hot Brain's only real problem is one that is common for the genre; they can only last so long. Hot Brain is not a game that you will want to spend hours playing, it is more of a "quick game" option for when you only have a few minutes to play, making it ideal as a portable. At the same time, you need to be able to set aside a decent chunk of time of uninterrupted play time, otherwise you are just spinning your wheels. You can only leave the game paused for a short time before it resets.
Two multiplayer modes, Competitive and Cooperative, are available as well. The Cooperative game supports two players while Competitive supports up to four assuming you can find three other people with a copy of the game. Though I wasn't able to try a four player game, I was lucky enough to stumble across a two-player game. I never felt that multiplayer added much, but that could have just been the company.