New Difficulty Settings
At the difficulty screen press left repeatedly to access Very Easy or Repeatedly Right to access Very Hard difficulty

Hanger Key (Hint)
1) Get TNT in tunnel and go to large boulder
2) Blow up boulder and go straight till you get to the hill on the right
3) Go to the house at the top of the hill and talk to the person there
4) Go to the dresser and press A to find the key

Enter ICHEAT as your name then enter one of the codes below while playing.

All Weapons A, Right, C-Down, C-Right, C-Up, A, Left
Weapon Power up C-Down, C-up,Up, Z, Z, Left, C-Right
Smart Bomb A, C-Up, C-Up, Up, Left.
Refill health and Fuel Down, Up, Right, A, B, Left, C-Right.
All Artifacts Up, C-Down, C-Right, Z, Up, Left
Kill Adam B, Left, C-Right, C-Right, Down
Weak Boss Z, C-Right, C-Right, B, Left, C-Right
Big Legged Aliens Left, A, Right, Down
Black Adam C-Left, C-Right, A, C-Down, C-Right, Left
Tall Adam B, A, C-Up, A, C-Up, A
Short Adam Down, C-Left, A, Right, Z
Mutant Alien(enter while facing harvester) C-Down, Up, Z(2), C-Right, Right.
Dancer Down, Up, C-Up, Down, C-Right, C-Right
Surreal C-Down, Up, Right(2), C-Right, A, Left