Sandbox Mode

The Sandbox mode can be accessed after getting either the Silver Trophy or the Gold Trophy. Entering the "Konami Code" : up, up, down, down, left, right, left, right, b , a, at the main menu screen, you will be instantly brought to the Sandbox Mode Tank.

Key Reference

While in the Sandbox Mode, you have the power to spawn any type of fish, pet or alien (except for Cyrax, though). Each has it's own corresponding key in the keyboard.

Fishes

Guppy - 1

Carnivore - 2

Star Fish - 3

Starcatcher - 4

Guppycruncher - 5

Beetlemuncher - 6

Breeder - 7

Ultravore - 8

Pets

Stinky - Q

Niko - W

Itchy - E

Prego - R

Zorf - T

Clyde - Y

Vert - U

Rufus - I

Meryl - O

Wadsworth - P

Seymour - A

Shrapnel - S

Gumbo - D

Blip - F

Rhubarb - G

Nimbus - H

Amp - J

Gash - K

Angie - L

Presto - ;

Bonus Pets

These must be in capital in order to spawn the bonus pets.

Brinkley - A

Nostradamus - S

Stanley - F

Walter - D

Aliens

Sylvester - Z

Balrog - X

Gus - C

Destructor - V

Ulysses - B

Psychosquid - N

Bilaterus - M

The tank background can be changed with the "+" and "-" keys. The music and backdrop at the beginning will be from the last tank you played in Challenge, Time Trial, or Bonus Adventure. If you didn't play any of these yet, tank 1's music and backdrop will be used.