For anyone who wants to know, combos are made by combining the same type of fruit. you can then increase it further by merging two merged fruit (of the same type) for the max combo.
I'm onto the 6th form and I feel the game is still relatively fun and addictive, although upgrades would be nice. It is a little tedious, but gathering 9x lemon combos usually the bar go up a reasonable amount.
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