"A plus minus B" is a game in which the player is asked to do simple arithmetic operations (additions & subtractions only) between 2 - and in a few cases 3 - numbers, to reach a given result, in order to cross-out all the 30 numbers of the given 5 by 6 table. This is done by tapping on the correct input values. For example, if the current level wants us to add 2 numbers and have a result of 10, one correct choice can be tapping on 8 and then 2 (obviously the order doesn't matter in addition but it does in subtraction). The numbers the player taps on have to produce the desired result of the specific level. Each time the correct numbers are tapped and the desired result is reached, the input values are crossed-out and the available numbers are decreased. The level is completed, when all 30 numbers are crossed-out.
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