The challenge mode is the hardest mode you could play in insaniquarium because every win,you get thousands of shells!!! Tank One-2,000, Tank Two-5,000, Tank Three-10,000 and

Tank Four- A whopping 40,000 shells!!!!.Tip:The best Pet Combination that is applicable to any level so far are Prego,Presto,Itchy and Gumbo.

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