ibb and obb is a 2D puzzle/platformer game. It can be played either solo or co-op and each has its own strengths and weaknesses. Essentially the game makes use of gravity in that once you pass through a 'barrier' the gravity is flipped. You can use the negative (or positive) gravity to help build momentum (as in Portal 2) in order to get past obstacles.
The game can be played solo, where you will control both characters each with one of the controller's thumbsticks (ibb with 
and obb with 
) or co-op, where each player takes control of one character. Playing co-op certainly is fun, BUT the game requires you to beat every level at least once in solo play to get a trophy, plus there is one other trophy you must also get solo (you WILL need a second controller for this specific trophy though). The rest of them can be obtained solo or in co-op.
There are a total of 11 trophies in the game and while you can get a majority of them in your first playthrough it will more than likely take you a few repeats of each level as missing just one collectable means you must restart and several of the levels require you to repeat them to find the secret levels hidden within the main levels. There is a level select however so you can replay each level as many times as necessary; and the levels are generally quite short. Only taking between 4-10 minutes to complete.
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