Three types of tool-crabs

After capturing, you will receive a mini-game tool reward, which will carry out a range attack on the fish in the fish pool.
 
 

Drill Crab 

After capturing the drill crab, you will gain a drill. Hold down the screen to adjust the firing angle, and release it to fire the drill bomb.
 
 

Unicorn

After capturing, you can get a reward equivalent to the corresponding multiplier × bet; The unicorn's multiplier will increase with the number of attacks from the cannon platform, up to 1000 times.
 
 

Mosasaurus

After capturing, you can get the dragon to carry out multiple full-screen attacks. You can get a reward up to 1000 times the bet.
 
The number on the purple crystal represents the number of attacks by the Mosasaurus.