Hard and Expert mode:
To unlock Hard mode, complete the game on Normal. To unlock Expert mode, complete the game on Hard.
Duplicate items:
To duplicate items you will need two Wii-motes and Nunchucks. Load the saved game file of the character who has the items you want to duplicate. Go to the Load Game screen. Press A on Player 1’s Wii-mote to activate Player 1. Then, on Player 2’s Wii-mote choose “Import Character” and select the same saved game file you just previously loaded. Choose the same character with Player 2. Have Player 2 drop the items you want to duplicate, and have Player 1 pick them up. Save the game and then load it again, but do not activate Player 2 this time. You will now get two of all items that you can drop. You can also buy ammo from your SCARAB with Player 2’s character and drop it. Note that if you do this too many times it can erase all the items that can be made by your SCARAB and the screen will be blank. Just continue playing the game and SCARAB a few items to fix it.
Character recommendation:
A good character to start out with is the Seal. Use his laser weapons which never run out of ammunition.