While a fairly fun platformer, it's plagued by being too easy and lacking real substance at its core.
The are multiple challenges that make up the challenges mode. There is Boss Rush, where you battle the bosses of each level back to back without the upgrades you've purchased from the story mode. Also there is challenges for each of the side characters, where you employ each of their special abilities in a level where if you die, then you have to start all over, which makes it frustratingly fun. The last type of challenge is a battle on each of the games levels where you take on multiple enemies. The challenges vary by difficulty but the tougher ones can make from some frustrating times. These two game modes are what makes up the bulk of Batman: The Brave and the Bold. The only other parts of the game are collectibles and upgrades.
The collectibles are in the form of character trophies, which are found in the levels in some hard-to-reach spots. Finding them is made much simpler with a gadget you get about halfway through the game, however, and takes away the challenge of finding them. Throughout the game, you collect little bat tokens from defeating enemies and breaking containers which you use to purchase upgrades from the Batcave. These includes new gadgets (such as a belt sword, grenade, and flashbang) and to make Batman's armor more powerful and increase the number of Batarangs that Batman throws at once. These upgrades make the already easy story mode even easier, but are pretty cool, especially the costumes you get from cheats.
Batman: The Brave and the Bold is fun, don't get me wrong. But I can't help but feel that it could have been so much more. Make each of the levels more detailed and a tad bit more difficult and this game could have been something special. However the challenges are very fun and difficult and adds a little bit of substance to a pretty bare game that can be fully competed in just over 5 hours.