A1: B, B1: B, C1: E, D1: B, E1: R, A2: R, E2: R, F2: E, A3: B, B3: E, C3: B, E3: E, F3: B, B4: B, C4: B, D4: B, E4: B, F4: R
Almost all weapons
C1: R, D1: R, E1: B, B2: E, D2: R, E2: E, A3: B, E3: E, B4: B, C4: R, F4: B
Final stage password
B1: R, C1: R, D1: E, E1: B, F1: B, B2: R, C2: R, E2: B, F2: R, A3: E, B3: B, C3: B, D3: R, E3: E, F3: E, A4: R, B4: E, D4: R, F4
Skip past Dr. Wily's Tank
A1: E, B1: R, C1: E, D1: E, E1: E, A2: B, B2: R, C2: E, E2: B, F2: E, A3: E, B3: E, C3: R, E3: R, A4: B, B4: R, C4: B, D4: E, E4
Skip to Dr. Wily
C1: E, D1: B, E1: E, F1: E, A2: B, B2: R, C2: R, D2: R, F2: E, A3: E, B3: B, D3: E, B4: E, C4: B, D4: E, E4: R, F4: B
Start game with 4 extra weapons
A1: R B1: R D1: B E1: R F1: B A2: E C2: B F2: R A3: R B3: B C3: B D3: R F3: B A4: E B4: E D4: E F4: R
This password starts you off with Beat, the Energy Balancer, max P-Chips (999), max E-Tanks (4), max W-Tanks (4), and max S-Tanks (1) but with no bosses beaten.
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Hints, Tips & Tricks
Better Buster
To get a better buster (gun), go into any level, and keep getting killed until asked to continue. Then do continue and do that again. After about the fourth time, you will go to Dr. Light's lab and you'll get a better gun (it deactivates when you turn the gameboy off).
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Fast Boot
To skip the Dr Light sequence and get to the robot selection screen faster is to when you first start the game and you are in Dr Light's laboratory, When Dr Light starts talking, reset the game by hitting Select, Start, A, and B simultaneously. When you are back at the Title screen. select Start game and hit start. You should now be at the Robot Selection screen.
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Secrets
Upgraded Mega Buster
To get an upgraded Mega Buster, get a lot of game overs in the same level. Soon, Dr. Light will call you to his lab, and he will upgrade your buster.