To enable the level select, hold down button 2 on the title screen and press Up, Up, Down, Down, Right, Right, Left, Left.
To play the “Marvinvaders2 mini-game, hold down the button 2 on the title screen and press Up, Right, Down, Left, Up, Down, Left, Right.
How to defeat all boss:
Go to the second level, shoot, avoid projectiles, jump and go down.
Again more times.
Shoot the tentaculs until the bandage appear.
Don’t forget to avoid fish-bones going up, to left and right.
Go up, stay on the border and shoot jumping to avoid missiles and bombs fragments.
Go up as you can, shoot until the seal move buttock to shoot the snow ball.
Go down 2 levels back, center and go up again.
Beware of stalactites falling.
Shoot on the string of the bell always moving from the left to the right to avoid the bird and the spider.
You must shoot the head.
The most difficult is to destroy the arrows (2 shoots for 1).
At the game over screen, hold the button 2, and input the following codes to show special animations. These codes must be entered before Marvin stops walking across the screen.
Animality 1 – Up, Right, Down, and Left.
Animality 2 – Up, Left, Down, and Right.
Fatality – Down, Right, Left, Left
Nudality 1 – Right, Right, Down, Left, Up, and Up.
Nudality 2 – Left, Left, Down, Right, Up, and Up.
Nudality 3 – Right, Left, Right, Left, Down, and Up.
Nudality 4 – Left, Right, Left, Right, Down, and Up.
Nudality 5 – Down, Down, Right, Up, Up, and Left.