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Challenge Mode is the most complex mode in the game. The player must fully understand the game in order to beat it.

Mechanics[]

The goal for this mode is the same as Adventure Mode: to collect three egg pieces to finish the level. However, there are twists to make the average session in this mode harder.

Every 4 seconds, each item that is already opened will increase its price by 1% of its starting price. For example, a guppy costs $100. 1% of it is $1. So, it's price will keep increasing by $1. Same goes with every other item. A $200 food quality upgrade will keep increasing its price by $2. A $300 food quantity upgrade will keep increasing its price by $3. Additionally, any item that is still locked after five minutes will automatically be unlocked. Once an egg piece is bought, all items will temporarily stop increasing in price. Non-egg piece items will additionally reset back to their starting price.

The longer it takes to finish the level, the harder the alien waves become, with the alien count and types becoming harder to handle. Also, when all of the fishes outside Wadsworth died or are eaten, he will fall asleep where the small and medium guppies will then be vulnerable to alien attacks.

Rewards[]

For every time a tank in Challenge Mode is completed, Shells will be given, and for the first 8 times, a story for Pets and Aliens. After getting all tank-specific stories (as well as having all Bonus Pets and upgrades), the next time any Challenge Mode tank is completed, the 33rd story will be unlocked. The Golden Trophy is obtained as well by unlocking the 33rd story.

Tank Shells Stories
1 2000 1-5, 21, 25 and 26
2 5000 2-10, 22, 27 and 28
3 10000 11-15, 23, 29 and 30
4 20000 16-20, 24, 31 and 32

Strategy[]

See also: Challenge Mode/Strategies

It's best to keep speed in mind in Challenge Mode, as the rising prices and endless amounts of aliens will be too overwhelming if it takes too long to beat the tank. Money-making pets are recommended to finish the level faster. You may also bring alien-attacking pets to deal with the increase of aliens later in the level. Buying an egg piece resets the prices of all other items, so it is better to buy the egg pieces one at a time to fully benefit from the reset. A good pet combination to finish any challenge tank faster is Amp, Angie, Presto, and Walter. Clicking on Amp shocks the guppies for potentially large amounts diamonds while Angie revives them. Clicking on Walter to activate Amp completely skips his cooldown. During alien attacks, changing Presto to Gumbo or Gash is recommended.

Trivia[]

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