A classic game. Even with the touch screen playing a very minor part...
Though it doesn't really use the touch screen (you only use it to rub a piece of dirty paper to let them discover something), the game still uses both screens. The purpose of the top screen is to depict the map or show where the babies are when they are apart from their older counterparts(e.g. Mario and Luigi lets the babies jump into a cave. Then the map on the top screen fades and becomes a location where the babies will set foot on). The graphics look great. The soundtrack, voices and sound effects are all good. The delivery of the scenes are hilariously cool. (the 2 screens give you a sort of panoramic view of what's happening) While the gameplay is easy to learn. Combat is also unique. Apart from the custom jumping and bouncing, there are these Bros. Items in which you can inflict very large damage (especially if you execute the attacks 'contained in the items' perfectly), either the 4 of them will attack or just 2 of them. According to age group, of course. Boss battles also require you to get your juices pumping and at the same time healing (like other RPGs).
Science is also applied to it. (Not E.Gadd!) During battle, do you notice when for example, Adult Luigi, Baby Luigi and Adult Mario have fainted. It is required that the surviving ally which is in the example, Baby Mario, should carry Baby Luigi. And in that process, comes the slowing down of jumps (to evade) which also makes the combat harder.
Child endangerment would also pay off in the game because, the babies fight. They even add damage during jump attacks or bros. item attacks. The only thing you should do is to press the designated button for them and you can go damaging your opponent all the way.
Unique skills which can be executed on the field (and sometimes battle) are also great. Just press L or R and press the button of the character. Mario and Luigi (adult) can 'fly' using the Spin Jump, they can cross paths faster by being a ball, while the babies can hammer (buttons or obstructions) and dig underground. These are used in almost every level.
The RPG elements also spruce up the game (that's why it's an RPG), you get experience, you level up, get money, buy items, equip clothing and badges and more.
Though bad thing is, some puzzles are repetitive and some levels might become hard to jump on. Some even require patience. But all in all, this game is a game you wouldn't want to miss in your life. Even if you play it more that 1 time, it can still entertain.