Collect the indicated number of "Platinum" awards, pause the game and enter the following codes:
Golden Gun: Get 1 "Platinum" award, X, Y, A, X, Y.
Improved traction: Get 3 "Platinum" awards, X, A(2), B, Y.
Improved battery: Get 5 "Platinum" awards, X, B(2), A, X.
Double ammunition: Get 7 "Platinum" awards, X(2), A, X, Y.
Double damage: Get 9 "Platinum" awards, X, Y(2), B, X.
Full ammunition: Get 11 "Platinum" awards, X(2), Y, B(2).
Cloak: Get 13 "Platinum" awards, X, Y, A, Y, B.
Full battery: Get 15 "Platinum" awards, X, Y(2), A, X.
All weapons: Get 17 "Platinum" awards, X, Y, A(2), X.
Infinite battery: Get 19 "Platinum" awards, X, B, X, B, Y.
Infinite ammunition: Get 23 "Platinum" awards, X, A, B, A, X.